CN213008070U

CN213008070U - Load device of pedal feel simulation system and pedal feel simulation system

Info

Publication number: CN213008070U
Application number: CN202021943874.8U
Authority: CN
Inventors: 陶喆; 朱心放; 高昌晟; 杜立新; 刘海珍
Original assignee: Nasn Automotive Electronics Co Ltd
Current assignee: Nasn Automotive Electronics Co Ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-04-20
Anticipated expiration: 2030-09-08

Abstract

The utility model relates to the technical field of pedal feel simulation, and discloses a load device of a pedal feel simulation system and the pedal feel simulation system, wherein the load device comprises a load piston, a first elastic unit and a second elastic unit, and the elastic coefficient of the first elastic unit is smaller than that of the second elastic unit; the second elastic unit has a first state in the initial state and a second state after being compressed, the load piston is in sliding fit with the piston cavity to drive the first elastic unit to be compressed, and the first elastic unit can be enabled to switch the second elastic unit from the first state to the second state; the limiting piece is used for adjusting the compression amount of the second elastic unit in the first state. The compression amount of the second elastic unit in the first state is adjusted through the limiting piece so as to adjust the pre-pressure of the second elastic unit, so that the position of the pedal force inflection point and the corresponding pedal force are adjusted, different pedal feelings are provided for different vehicle types, and the pedal feeling of a driver is more real.

Description

Load device of pedal feel simulation system and pedal feel simulation system

Technical Field

The utility model relates to a simulation technical field is felt to the footboard, especially relates to a load device and footboard of simulation system are felt to footboard.

Background

In a whole vehicle pedal feeling simulation system, the force feedback of a brake pedal, namely the pedal feeling, is a very intuitive dimension for evaluating the whole vehicle impression of a driver, and the evaluation of the quality of the whole vehicle by a consumer is directly influenced by the quality of the pedal feeling.

Under the trend that the demand of new forms of energy motorcycle type and intelligent driving even autopilot is increasing day by day, higher requirement has been proposed to the footboard sense analog system of car, and traditional vacuum booster hardly satisfies the requirement to aspects such as initiative safety, response time are short, change driving style, so in order to satisfy higher market demand, electronic brake booster takes place in return.

In order to realize energy recovery, most of the electronic brake boosters are connected in a decoupling mode, namely, a brake pedal of a driver is separated from a brake master cylinder, the driver cannot apply pressure to the brake master cylinder under normal working conditions, and the motor applies pressure to the brake master cylinder through a speed reducing mechanism to achieve the purpose of braking. The connection mode needs to simulate the pedal feeling of the driver so that the driver can feel the real brake feeling, and the mechanism which is responsible for carrying out feedback simulation on the brake pedal feeling of the driver in the electronic brake boosting system is called as a pedal feeling simulation system.

The pedal feel simulation system is basically divided into two types, namely a spring pedal feel simulation system and a hydraulic pedal feel simulation system, when the two brake pedal feel simulators are adopted for pedal feel simulation, a pedal force inflection point exists at a position of 30-40 mm of a brake pedal stroke, and the pedal forces before and after the inflection point are different. The pedal force corresponding to the inflection point of the existing pedal feeling simulation system is invariable, and the requirements of different vehicle models on different pedal forces are difficult to meet.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a load device and footboard of analog system are felt to footboard can satisfy the demand that different motorcycle types felt to the footboard.

To achieve the purpose, the utility model adopts the following technical proposal:

a load device of a pedal feel simulation system comprises a shell provided with a piston cavity, and a load piston, a first elastic unit and a second elastic unit which are sequentially arranged in the piston cavity along a first direction, wherein the elastic coefficient of the first elastic unit is smaller than that of the second elastic unit;

the second elastic unit has a first state at the initial time and a second state after being compressed, the load piston is in sliding fit with the piston cavity to drive the first elastic unit to be compressed, and the first elastic unit can be enabled to switch the second elastic unit from the first state to the second state;

the limiting piece is used for adjusting the compression amount of the second elastic unit in the first state.

As a preferable technical solution of the load device of the pedal feel simulation system, the load device further includes a first mounting seat disposed in the piston cavity, and the second elastic unit is interposed between the first mounting seat and an inner wall of the housing;

when the second elastic unit is in the first state, the first mounting seat abuts against the limiting piece; when the second elastic unit is in the second state, the first mounting seat is separated from the limiting piece.

As a preferable technical solution of the load device of the pedal feel simulation system, the load device further includes a second mounting seat which can slide in the piston cavity along the first direction, and the second mounting seat is sandwiched between the first elastic unit and the second elastic unit;

the first elastic unit includes:

the first elastic piece is clamped between the load piston and the second mounting seat;

one end of the damping piece is connected to the second mounting seat, and the other end of the damping piece can be abutted to the load piston or separated from the load piston; or one end of the damping piece is connected to the load piston, and the other end of the damping piece can be abutted to the second mounting seat or separated from the second mounting seat.

As a preferable aspect of the load device of the pedal feel simulation system described above, the damping member is made of rubber.

As a preferable aspect of the load device of the pedal feel simulation system, when the damping member is connected to the second mounting seat, an outer diameter of the damping member tends to increase in the first direction;

when the damping piece is connected to the load piston, the outer diameter of one end, away from the second mounting seat, of the damping piece tends to decrease along a first direction.

As a preferable technical solution of the load device of the pedal feel simulation system, the limiting member is screwed to the housing.

The utility model also provides a simulation system is felt to footboard, load device including brake pedal, drive assembly and foretell footboard feel simulation system, brake pedal can pass through the drive assembly drive the load piston is in slide along the first direction in the piston cavity.

As an preferable technical solution of the pedal feel simulation system, the load piston divides the piston cavity into a first oil cavity and a second oil cavity which are not communicated with each other, the first elastic unit and the second elastic unit are both disposed in the second oil cavity, the housing is provided with a load oil cavity communicated with the first oil cavity, and the transmission assembly includes:

a rod piston slidably penetrating the load chamber to change a volume of the load chamber;

and one end of the push rod is hinged with the brake pedal, and the other end of the push rod is hinged with the push rod piston ball.

As a preferable technical solution of the pedal feel simulation system, the pedal feel simulation system further includes a displacement sensor for measuring a displacement of the push rod piston moving in the load oil chamber.

As a preferable technical solution of the pedal feel simulation system, the pedal feel simulation system further includes an elastic return member for providing an acting force for moving the push rod piston to the side where the push rod is located.

The utility model has the advantages that: the utility model provides a load device of analog system is felt to footboard can adjust the compression when second elastic element is in the first state through the locating part to adjust second elastic element's pre-compression, thereby adjust the position of footboard power flex point and the footboard power size that corresponds, feel for different motorcycle types provide different footboard, make driver's footboard feel truer, thereby satisfy the demand that the vehicle of different models felt to the footboard.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is an exploded view of a pedal feel simulation system according to an embodiment of the present invention;

fig. 2 is an exploded view of a pedal feel simulation system according to an embodiment of the present invention;

fig. 3 is a partial sectional view of a pedal feel simulation system according to an embodiment of the present invention;

fig. 4 is a partial sectional view of a pedal feel simulation system according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second mounting seat provided in an embodiment of the present invention;

fig. 6 is a graph showing the relationship between the pedal force and the displacement of the load piston according to the embodiment of the present invention.

In the figure:

11. a flange plate; 12. a plug; 13. a dust cover; 14. a spring seat;

21. a load piston; 22. a first elastic member; 23. a second elastic unit; 24. a damping member; 25. a limiting member; 26. a second mounting seat; 261. a first liquid passing hole; 27. a first mounting seat; 271. a second liquid passing hole;

31. a first oil chamber; 32. an oil cavity A; 33. an oil chamber B; 34. a load oil chamber;

41. a pedal connection unit; 42. a push rod; 43. a push rod piston;

5. an elastic reset member;

61. a first seal member; 62. a second seal member; 63. a third seal member; 64. a fourth seal member;

71. a shock absorbing member; 72. a limiting plate; 73. a locking cap; 74. a displacement sensor;

81. a diverter valve; 82. an oil pipe; 83. a first clamp; 84. a second clamp; 85. an oil inlet and an oil outlet;

9. pressing bolts;

10. a sleeve.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

As shown in fig. 1 to 5, the present embodiment provides a load device of a pedal feel simulation system and the pedal feel simulation system, wherein the pedal feel simulation system includes the load device of the pedal feel simulation system.

The load device of the pedal feel simulation system comprises a shell provided with a piston cavity, and a load piston 21, a first elastic unit and a second elastic unit 23 which are sequentially arranged in the piston cavity along a first direction; the elastic coefficient of the first elastic unit is smaller than that of the second elastic unit 23; the second elastic unit 23 has an initial first state and a compressed second state, the load piston 21 is in sliding fit with the piston cavity to drive the first elastic unit to compress, and the first elastic unit can switch the second elastic unit 23 from the first state to the second state, a limiting member 25 is arranged in the housing, and the limiting member 25 is used for adjusting the compression amount of the second elastic unit 23 when the second elastic unit 23 is in the first state. The second elastic unit 23 is a compression spring.

Specifically, a second mounting seat 26 in sliding fit with the piston cavity along the first direction is arranged in the piston cavity, the second mounting seat 26 is arranged between the first elastic unit and the second elastic unit 23, a first mounting seat 27 abutted against the second mounting seat 26 is arranged on one side, facing the second elastic unit 23, of the second mounting seat 26, the second elastic unit 23 is clamped between the first mounting seat 27 and the inner wall of the housing, when the second elastic unit 23 is in the first state, the first mounting seat 27 abuts against the limiting piece 25, and a certain pre-pressure is generated in the second elastic unit 23 in the assembling state through the limiting piece 25; the load piston 21 can push the first mounting seat 27 to move along the first direction through the second mounting seat 26, so as to switch the second elastic unit 23 from the first state to the second state, and separate the first mounting seat 27 from the limiting member 25.

In this embodiment, the sleeve 10 is embedded in the piston cavity, and the load piston 21 penetrates through the sleeve 10 and is slidably connected with the sleeve 10.

The first elastic unit includes a first elastic member 22 interposed between the load piston 21 and the second mounting seat 26, and in this embodiment, the first elastic member 22 is a compression spring. The second mounting seat 26 is provided with a mounting cavity with an opening at one end, the opening of the mounting cavity faces the load piston 21, one end of the first elastic element 22 abuts against the inner bottom wall of the mounting cavity, the other end of the first elastic element abuts against the load piston 21, and the load piston 21 can abut against the opening end face of the second mounting seat 26 so as to seal the first elastic element 22 in the mounting cavity.

When the brake pedal is stepped on, the load piston 21 moves along the first direction, the load piston 21 will push the first elastic member 22 to compress, when the load piston 21 abuts against the second mounting seat 26, the load piston 21 blocks the opening of the mounting cavity, the first elastic member 22 is blocked in the mounting cavity by the load piston 21, the deformation amount of the first elastic member 22 will not change, and as the load piston 21 continues to move along the first direction, the load piston 21 will push the first mounting seat 27 to act through the second mounting seat 26, so as to press the second elastic unit 23 by using the first mounting seat 27.

After the load piston 21 abuts against the second mounting seat 26, the first elastic member 22 is blocked in the mounting cavity by the load piston 21, and at this time, the pre-pressure of the second elastic unit 23 is equal to the acting force applied to the second mounting seat 24 by the first elastic member 22, and since the elastic coefficient of the first elastic unit is smaller than that of the second elastic unit 23, the ascending gradient of the pedal force will be increased.

Usually, the position where the pedal force changes obviously before and after the gradient of the pedal force rises is recorded as a pedal force inflection point, the position where the load piston 21 abuts against the second mounting seat 26 is a pedal force inflection point, the compression amount of the second elastic unit 23 in the first state is changed by adjusting the limiting piece 25, so that the pre-tightening force of the second elastic unit 23 is changed, the position of the pedal force inflection point and the corresponding pedal force are adjusted, different pedal feelings are provided for different vehicle types, the pedal feeling of a driver is more real, and the requirements of vehicles of different models on the pedal feeling are met.

Further, the stopper 25 is screwed to the housing, preferably, the stopper 25 is an adjusting screw, and one end of the second elastic unit 23 abuts against a head of the adjusting screw. Through screwing the adjusting screw, when changing the butt of second elastic unit 23 in adjusting screw's head, the compression capacity of second elastic unit 23 to adjust load piston 21 butt in the position and the pedal power size of second mount pad 26, feel for the different motorcycle types provide different footboard, feel more true for driver's footboard, thereby satisfy the demand that the vehicle of different models felt to the footboard.

When the load device is used for pedal feel simulation, in the process that the second elastic unit 23 is further compressed, after the whole vehicle reaches the locking pressure, the subsequent pedal force maintains the original ascending gradient, and an undersupport feeling is caused to a driver at the moment. For this purpose, the first elastic unit further includes a damper 24 disposed between the second mounting seat 26 and the load piston 21, and one end of the damper 24 is connected to the second mounting seat 26 and the other end thereof can be brought into contact with the load piston 21 or separated from the load piston 21. In other embodiments, one end of the damping member 24 may be connected to the load piston 21, and the other end may abut against the second mounting seat 26 or be separated from the second mounting seat 26.

Preferably, the load piston 21 is in a separated state from the second mount 26 just when the load piston 21 contacts the damping member 24. When the load piston 21 moves in the first direction, the load piston 21 will press the first resilient member 22 to compress the first resilient member 22. After the load piston 21 contacts the damping member 24, the damping member 24 will hinder the load piston 21 from further moving in the first direction, and as the external force applied to the load piston 21 increases to a certain extent, the load piston 21 will continue to move in the first direction, the damping member 24 is compressed, and the first elastic member 22 is further compressed. When the load piston 21 abuts against the second mounting seat 26, the first elastic member 22 and the damping member 24 are both blocked in the space enclosed by the second mounting seat 26 and the load piston 21, the deformation amount of the first elastic member 22 and the deformation amount of the damping member 24 do not change any more, at this time, the pre-pressure of the second elastic unit 23 is equal to the sum of the acting forces applied to the second mounting seat 24 by the first elastic member 22 and the damping member 24, and as the load piston 21 continues to move in the first direction, the load piston 21 pushes the first mounting seat 27 through the second mounting seat 26 to act so as to press the second elastic unit 23 by the first mounting seat 27.

After the damping member 24 is added, the position where the load piston 21 contacts the damping member 24 is a pedal force inflection point, at this time, the first elastic member 22 and the damping member 24 are both blocked in the space enclosed by the second mounting seat 26 and the load piston 21, and the pre-pressure of the second elastic unit 23 is equal to the sum of the acting forces applied to the second mounting seat 24 by the first elastic member 22 and the damping member 24. By selecting the second elastic unit 23 having a larger elastic coefficient, the pedal force rising gradient increases after the load piston 21 contacts the damper 24.

As shown in fig. 6, the pedal feel simulation system provided by this embodiment implements three-stage pedal feel curves, the first elastic member 22 provides resistance for the first stage pedal feel curve, the first elastic member 22 and the damping member 24 provide resistance for the second stage pedal feel curve, the first elastic member 22, the second elastic unit 23 and the damping member 24 provide resistance for the third stage pedal feel curve, the pedal force rising gradient before and after each pedal force inflection point has obvious change, when the whole vehicle reaches the locking pressure, due to the addition of the second elastic unit 23, the subsequent ascending gradient of the pedal force is increased, the problem that a driver feels under-supported after the whole vehicle reaches the locking pressure is solved, sufficient damping feeling is provided, real hydraulic pedal feeling is provided for the driver, and the problem that the driver is tired due to long-time treading of the brake pedal is avoided.

Preferably, the damper 24 is made of rubber. In fig. 6, the upper curve corresponds to the brake pedal depression process, and the lower curve corresponds to the brake pedal release process. Because the rubber material has viscoelasticity, the speed of the damping piece 24 made of rubber for recovering deformation is slow, and as is obvious from fig. 6, when the brake pedal is released, the force applied to the foot by the brake pedal is reduced when the load piston 21 is at the same position, so that the foot supporting feeling can not be caused to a driver, sufficient return hysteresis feeling is provided, and the quality of the pedal feeling is improved.

Further, the outer diameter of the end of the damping member 24 near the load piston 21 has a tendency to increase in the first direction. Specifically, the end of the damping member 24 facing the load piston 21 is tapered. By adopting the tapered structure, elastic deformation of the damping member 24 made of rubber is facilitated. The load piston 21 is provided with an accommodating cavity for accommodating the damping member 24 and matching with the tapered structure, so that the damping member 24 is accommodated in a space enclosed by the accommodating cavity and the mounting cavity when the load piston 21 abuts against the second mounting seat 26.

In this embodiment, the housing includes a flange 11 and a plug 12, and the flange 11 and the plug 12 are detachably connected to form the piston cavity. A boss is convexly arranged in the plug 12, a threaded hole is formed in the boss, and the free end of the rod part of the adjusting screw is in threaded connection with the threaded hole. The flange plate 11 and the plug 12 are detachably connected, so that the installation of the adjusting screw, the first elastic member 22, the second elastic unit 23, the damping member 24, the second mounting seat 26, the first mounting seat 27 and the load piston 21 is facilitated. Preferably, the flange 11 and the plug 12 are screwed together.

In other embodiments, the head of the adjusting screw may be exposed outside the housing, the rod of the adjusting screw extends into the piston cavity and is connected to the limit plate 72, and the second elastic unit 23 is clamped between the limit plate 72 and the inner wall of the housing. The head of the adjusting screw is exposed out of the housing, so that the compression amount of the second elastic unit 23 can be conveniently adjusted through the adjusting screw.

The embodiment also provides a pedal feel simulation system, which comprises a brake pedal, a transmission assembly and the load device of the pedal feel simulation system, wherein the brake pedal can drive the load piston 21 to slide in the piston cavity along the first direction through the transmission assembly.

The piston cavity is divided into a first oil cavity 31 and a second oil cavity by the load piston 21, the first elastic unit and the second elastic unit 23 are both arranged in the second oil cavity, the load oil cavity 34 communicated with the first oil cavity 31 is arranged on the shell, the transmission assembly comprises a push rod piston 43 and a push rod 42, the push rod piston 43 penetrates through the load oil cavity 34 in a sliding mode to change the volume of the load oil cavity 24, one end of the push rod 42 is hinged to the brake pedal, and the other end of the push rod 42 is in ball hinge connection with the push rod piston 43. In this embodiment, the brake pedal is rotatably connected with the pedal connection unit 41, and the pedal connection unit 41 is connected with the push rod 42, so that the brake pedal is rotatably connected with the push rod 42.

The rotation of the brake pedal is converted into the movement of the pushrod piston 43 by the pushrod 42, and when the pushrod piston 43 moves in the first direction, the working oil in the load oil chamber 34 flows into the first oil chamber 31, so that the load piston 21 moves in the first direction by the oil pressure in the oil chamber.

An oil storage tank is arranged outside the shell, a reversing valve 81 is arranged on a communicating oil passage of the load oil chamber 34 and the first oil chamber 31, and the load oil chamber 34 is controlled to be selectively communicated with the first oil chamber 31 or the oil storage tank through the reversing valve 81. Preferably, the direction valve 81 is an electromagnetic direction valve having a first state and a second state, and when the direction valve 81 is in the first state, the load oil chamber 34 is communicated with the first oil chamber 31; when the direction valve 81 is in the second state, the load oil chamber 34 communicates with the oil reservoir. When the pedal feel simulation system is not operating, the selector valve 81 is in the second state.

Specifically, the flange plate 11 is provided with an oil inlet and outlet port 85 communicated with the load oil chamber 34, and the oil inlet and outlet port 85 is communicated with the oil storage tank through an oil pipe 82. Specifically, one end of the oil pipe 82 communicates with the oil inlet/outlet port 85 through the first collar 83, and the other end communicates with the oil tank through the second collar 84.

In the present embodiment, the load piston 21 is slidably and sealingly connected to the inner wall of the piston chamber by the first seal 61 to divide the piston chamber into the first oil chamber 31 and the second oil chamber, and the working oil in the first oil chamber 31 is prevented from entering the second oil chamber through the gap between the load piston 21 and the inner wall of the piston chamber by the first seal 61. The rod piston 43 has a stepped structure, one end of the rod piston 43 is slidably and sealingly connected to the inner wall of the load oil chamber 34 by a second seal 62, the other end of the rod piston 43 is slidably and sealingly connected to the inner wall of the load oil chamber 34 by a third seal 63, and the load oil chamber 34 is formed into a closed oil chamber communicating with the first oil chamber 31 by the second seal 62 and the third seal 63. The sensitivity of the action of the load piston 21 during the action of the brake pedal is improved by the arrangement. The first seal 61, the second seal 62 and the third seal 63 are seal cups.

Furthermore, a cooling liquid inlet and a cooling liquid outlet which are communicated with the second oil cavity are formed in the shell. Since a large amount of heat is generated during the repeated pressing of the damping member 24, the cooling fluid is continuously melted into the second oil chamber through the cooling fluid inlet and flows out through the cooling fluid outlet to cool the damping member 24. A fourth seal 64 is provided between the flange 11 and the stopper 12 to prevent leakage of the coolant. Preferably, the fourth seal 64 is a gasket.

The first mounting seat 27 is slidably connected with the inner wall of the piston cavity, the first mounting seat 27 divides the second oil cavity into an oil cavity A32 and an oil cavity B33, the first elastic unit is arranged in the oil cavity A32, the second elastic unit 23 is arranged in the oil cavity B33, the first mounting seat 27 is provided with a first liquid passing hole 261, the first mounting seat 27 is provided with a second liquid passing hole 271, the oil cavity A32 and the oil cavity B33 are communicated through the first liquid passing hole 261 and the second liquid passing hole 271, so that cooling liquid in the oil cavity A32 enters the oil cavity B33, and the second elastic unit 23 is cooled by the cooling liquid.

Further, the pedal feel simulation system further includes a displacement sensor 74 for measuring a distance that the push rod piston 43 moves in the first direction.

Specifically, a first step surface is formed at one end of the push rod piston 43 away from the push rod 42, a limit plate 72 is sleeved on the push rod piston 43, the push rod piston 43 is connected with a locking cap 73, and the limit plate 72 is clamped between the first step surface and the locking cap 73. The displacement sensor 74 includes a hall chip and a magnet, in this embodiment, the magnet is disposed on the limiting plate 72, the hall chip is fixed relative to the housing, and when the push rod piston 43 moves along the first direction, the magnet will follow the action of the push rod piston 43, so that the hall chip and the magnet move relatively to measure the displacement of the push rod piston 43. The displacement sensor 74 is disposed outside the housing for easy assembly and disassembly.

Further, a damper 71 is provided on the stopper plate 72 facing side of the plug 12, and when the plunger piston 43 reciprocates to bring the stopper plate 72 into contact with the outer wall of the plug 12, the damper 71 can damp vibration. In other embodiments, the shock absorbing member 71 may be disposed on the side of the limiting plate 72 facing the plug 12.

Further, the pedal feel simulation system further includes an elastic restoring member 5 for providing an external force to the push rod piston 43 to make it slide in the reverse direction of the first direction, so as to increase the restoring speed of the brake pedal. Preferably, the elastic restoring member 5 is a spring.

Specifically, one side of the flange plate 11, which is back to the plug 12, is sequentially provided with a dust cover 13 and a spring seat 14, one end of the push rod piston 43 is connected to the flange plate 11, the other end of the push rod piston is connected to the spring seat 14, the elastic resetting piece 5 is clamped between the spring seat 14 and the outer wall of the flange plate 11, and the push rod piston 43 is fixed relative to the spring seat 14. The dust cover 13 is a bellows.

When the push rod piston 43 moves along the first direction, the push rod piston 43 moves towards the flange plate 11 through the spring seat 14, and the dust cover 13 and the elastic resetting piece 5 are both extruded; when the push rod piston 43 slides in the reverse direction of the first direction, the push rod piston 43 is quickly reset under the action of the elastic reset piece 5 and the oil pressure in the load oil chamber 34, and simultaneously, the protective cover is reset.

When the pedal feel simulation system does not work, the reversing valve 81 is in the second state, the piston cavity is communicated with the oil storage tank, the first elastic piece 22, the second elastic unit 23 and the damping piece 24 separate the load piston 21 from the damping piece 24, and the reset elastic piece resets the brake pedal.

The working process of the pedal feeling simulation system is as follows:

the brake pedal is pressed, the reversing valve 81 is switched to a first state, the load oil chamber 34 is communicated with the first oil chamber 31, the push rod piston 43 is moved along a first direction through the pedal connecting unit 41 and the push rod 42, the working oil in the load oil chamber 34 enters the first oil chamber 31, the load piston 21 is moved along the first direction under the action of the oil pressure in the first oil chamber 31, and the first elastic piece 22 is compressed; after the load piston 21 moves a certain distance, the load piston 21 abuts against the damper 24, and the rising gradient of the pedal force applied to the brake pedal increases.

As the load piston 21 continues to move in the first direction, the load piston 21 continues to press the first elastic member 22 and simultaneously presses the damping member 24, and when the load piston 21 abuts against the second mounting seat 26, the rising gradient of the pedal force applied to the brake pedal increases again, at this time, the first elastic member 22 and the damping member 24 are blocked in the space surrounded by the load piston 21 and the second mounting seat 26, the first elastic member 22 and the damping member 24 maintain the current compression state, and the sum of the return force of the first elastic member 22 and the return force of the damping member 24 is equal to the pre-pressure of the second elastic unit 23.

As the load piston 21 continues to move in the first direction, the damping member 24 is compressed until the load piston 21 abuts the plug 12, the damping member 24 will not be compressed any further, and the load piston 21 reaches the limit travel.

In the pedal feel simulation system provided by this embodiment, the flange plate 11 is connected to other structural members through a plurality of press-fitting bolts 9 arranged circumferentially to fix the pedal feel simulation system.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. A load device of a pedal feel simulation system comprises a shell provided with a piston cavity, and a load piston (21), a first elastic unit and a second elastic unit (23) which are sequentially arranged in the piston cavity along a first direction, wherein the elastic coefficient of the first elastic unit is smaller than that of the second elastic unit (23); it is characterized in that the preparation method is characterized in that,

the second elastic unit (23) has a first state at the initial time and a second state after being compressed, the load piston (21) is in sliding fit with the piston cavity to drive the first elastic unit to be compressed, and the first elastic unit can be enabled to switch the second elastic unit (23) from the first state to the second state;

the elastic unit further comprises a limiting piece (25) used for adjusting the compression amount of the second elastic unit (23) in the first state.

2. The load device of the pedal feel simulation system according to claim 1, further comprising a first mounting seat (27) provided in the piston chamber, the second elastic unit (23) being interposed between the first mounting seat (27) and an inner wall of the housing;

when the second elastic unit (23) is in the first state, the first mounting seat (27) abuts against the limiting piece (25); when the second elastic unit (23) is in the second state, the first mounting seat (27) is separated from the limiting piece (25).

3. The load device of the pedal feel simulation system according to claim 2, further comprising a second mount (26) slidable in the first direction within the piston chamber, the second mount (26) being interposed between the first elastic unit and the first mount (27);

the first elastic unit includes:

a first elastic member (22) interposed between the load piston (21) and the second mount (26);

a damper (24) having one end connected to the second mounting seat (26) and the other end capable of coming into contact with the load piston (21) or separating from the load piston (21); or one end of the damping piece (24) is connected to the load piston (21), and the other end can be abutted to the second mounting seat (26) or separated from the second mounting seat (26);

the first elastic member (22) has a smaller elastic coefficient than the damping member (24).

4. The load device of the pedal feel simulation system according to claim 3, wherein the damper (24) is made of rubber.

5. The load device of the pedal feel simulation system according to claim 3, wherein when the damper (24) is coupled to the second mount (26), an outer diameter of an end of the damper (24) remote from the second mount (26) has a tendency to increase in the first direction;

the damping member (24) has a tendency to decrease in outer diameter in a first direction when the damping member (24) is connected to the load piston (21).

6. The load device of the pedal feel simulation system according to any one of claims 1 to 5, wherein the stopper (25) is threadedly connected to the housing.

7. A pedal feel simulation system comprising a brake pedal, a transmission assembly and a load device of the pedal feel simulation system according to any one of claims 1 to 6, the brake pedal being capable of driving the load piston (21) to slide in a first direction within the piston chamber via the transmission assembly.

8. The pedal feel simulation system according to claim 7, wherein the load piston (21) divides the piston chamber into a first oil chamber (31) and a second oil chamber which are not communicated with each other, the first elastic unit and the second elastic unit (23) are both disposed in the second oil chamber, a load oil chamber (34) communicated with the first oil chamber (31) is provided on the housing, and the transmission assembly includes:

a rod piston (43) sliding through the load oil chamber (34) to change a volume of the load oil chamber (34);

and one end of the push rod (42) is hinged with the brake pedal, and the other end of the push rod (42) is in ball hinge with the push rod piston (43).

9. The pedal feel simulation system of claim 8, further comprising a displacement sensor (74) for measuring displacement of the pushrod piston (43) moving within the load oil chamber.

10. The pedal feel simulation system of claim 8, further comprising a resilient return member (5) for providing a force to move the push rod piston (43) to the side of the push rod (42).