CN112849107B - Hierarchical brake pedal simulator - Google Patents
Hierarchical brake pedal simulator Download PDFInfo
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- CN112849107B CN112849107B CN202110212092.XA CN202110212092A CN112849107B CN 112849107 B CN112849107 B CN 112849107B CN 202110212092 A CN202110212092 A CN 202110212092A CN 112849107 B CN112849107 B CN 112849107B
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- piston
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- brake pedal
- piston cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
- B60T8/409—Systems with stroke simulating devices for driver input characterised by details of the stroke simulating device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/08—Brake-action initiating means for personal initiation hand actuated
- B60T7/085—Brake-action initiating means for personal initiation hand actuated by electrical means, e.g. travel, force sensors
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention relates to the field of automobiles, in particular to a graded brake pedal simulator, which comprises: the brake device comprises a piston cylinder part, a brake pedal part and a brake mechanism part, wherein the piston cylinder part is provided with a piston cylinder and a plurality of oil holes penetrating through the side wall of the piston cylinder; the main cylinder body part is arranged on the side wall of the piston cylinder and communicated with the oil hole, a main piston is arranged in the main cylinder body part to form an air cavity and an oil liquid cavity, one end of the oil liquid cavity, which is close to the oil hole, is provided with a valve group, and the valve group controls the opening and closing of the oil hole of the part; the brake pedal is stressed to push the piston assembly to move, and the piston assembly moves to extrude a medium in the piston cylinder to enter the oil liquid cavity through a part of oil holes; and the medium in the oil cavity flows back to the piston cylinder through all the oil holes after the stress of the brake pedal is relieved. The invention has the beneficial effects that: the graded brake pedal simulator has the advantages of compact structure, small volume and high space utilization rate, and solves the feeling problem of foot feedback of a driver when a motor-controlled brake system brakes.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a graded brake pedal simulator.
Background
The development of science and technology promotes various industries to develop towards automation and intellectualization, and under the trend of automobile electrification and intellectualization, more and more automobile brake systems do not adopt the traditional mechanical brake system structure but adopt motor control. The motor control can enable the reaction of the brake system to be quicker, the quantitative control is easier, and the matching degree with the algorithm is higher.
However, the motor-controlled brake system does not have the mechanical structure of the conventional brake system, so that the feedback feeling obtained when a driver steps on the brake pedal is inferior to that of the conventional brake system, a hierarchical brake pedal simulator needs to be designed, the problem of feedback feeling of the feet of the driver during braking is solved, and the driving consistency of the motor-controlled brake system and the conventional automobile is ensured.
Disclosure of Invention
The present invention is directed to a staged brake pedal simulator to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a graduated brake pedal simulator comprising: the brake device comprises a piston cylinder part, a brake pedal part and a brake mechanism part, wherein the piston cylinder part is provided with a piston cylinder and a plurality of oil holes penetrating through the side wall of the piston cylinder; the main cylinder body part is arranged on the side wall of the piston cylinder and communicated with the oil hole, a main piston is arranged in the main cylinder body part to form an air cavity and an oil liquid cavity, one end of the oil liquid cavity, which is close to the oil hole, is provided with a valve group, and the valve group controls the opening and closing of the oil hole of the part; the brake pedal is stressed to push the piston assembly to move, and the piston assembly moves to extrude a medium in the piston cylinder to enter the oil liquid cavity through a part of oil holes; and the medium in the oil cavity flows back to the piston cylinder through all the oil holes after the stress of the brake pedal is relieved.
As a further scheme of the invention: the piston assembly comprises a piston and a push rod integrally installed with the piston, and one end, far away from the piston cylinder, of the push rod is connected with a brake pedal.
As a still further scheme of the invention: and a sensor is arranged between the push rod and the brake pedal and is used for detecting the displacement of the push rod and feeding back a control signal to the electric brake system.
As a still further scheme of the invention: sealing elements for sealing the piston cylinder are installed on two contact surfaces of the piston and the piston cylinder in a staggered mode; and an elastic part is arranged in the piston cylinder and elastically supports the piston assembly.
As a still further scheme of the invention: the main cylinder body part comprises a main cylinder body, and the main piston is arranged in the main cylinder body through an elastic supporting piece to form an air cavity and an oil cavity.
As a still further scheme of the invention: one end of the main cylinder body close to the oil liquid cavity is provided with a medium channel corresponding to the oil hole; the main cylinder body is provided with an adjusting piece which penetrates through the side wall of the main cylinder body and extends into the medium channel, and the adjusting piece controls the oil passing amount of the medium channel.
As a still further scheme of the invention: and sealing elements are respectively arranged at the joints of the main cylinder body, the main piston and the piston cylinder.
As a still further scheme of the invention: and a brake backup system is arranged at one end of the piston cylinder part, which is far away from the piston assembly, and the piston assembly triggers the brake backup system when moving to be in contact with a triggering part of the brake backup system.
Compared with the prior art, the invention has the beneficial effects that: the graded brake pedal simulator is composed of a piston cylinder part and a main cylinder body part, has compact structure, small volume and high space utilization rate, solves the feeling problem of foot feedback of a driver when the motor-controlled brake system brakes, and simultaneously keeps the quick response performance and control precision of the motor-controlled brake system.
Drawings
Fig. 1 is a schematic structural diagram of a stepped brake pedal simulator in an embodiment of the present invention.
Fig. 2 is a partial structural schematic diagram of fig. 1.
Fig. 3 is a schematic structural view of a stepped brake pedal simulator in accordance with another embodiment of the present invention.
In the drawings: 1. a push rod; 2. a piston; 3. a first seal ring; 4. a second seal ring; 5. a piston cylinder; 6. an O-shaped sealing ring; 7. a valve seat; 8. a conical spring I; 9. a primary piston; 10. a conical spring II; 11. a main cylinder cover; 12. a main cylinder body; 13. a third seal ring; 14. a steel ball; 15. a fourth seal ring; 16. a throttle valve; 17. a fifth seal ring; 18. a compression spring; 19. a spring; 20. an oil receiving pot; 21. a displacement sensor; 22. triggering the push rod; 23. a brake master cylinder; 24. and a brake wheel cylinder.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Referring to fig. 1, in an embodiment of the present invention, a hierarchical brake pedal simulator includes: the brake device comprises a piston cylinder part, a brake pedal part and a brake mechanism part, wherein the piston cylinder part is provided with a piston cylinder and a plurality of oil holes penetrating through the side wall of the piston cylinder; the main cylinder body part is arranged on the side wall of the piston cylinder and communicated with the oil hole, a main piston is arranged in the main cylinder body part to form an air cavity and an oil liquid cavity, one end of the oil liquid cavity, which is close to the oil hole, is provided with a valve group, and the valve group controls the opening and closing of the oil hole of the part; the brake pedal is stressed to push the piston assembly to move, and the piston assembly moves to extrude a medium in the piston cylinder to enter the oil liquid cavity through a part of oil holes; and the medium in the oil cavity flows back to the piston cylinder through all the oil holes after the stress of the brake pedal is relieved.
Specifically, the number of the oil holes is two, and the valve group corresponds to a second oil hole in the left side of the piston cylinder 5; the piston assembly comprises a piston 2 and a push rod 1 integrally installed with the piston 2, one end, far away from a piston cylinder 5, of the push rod 1 is connected with a brake pedal, an elastic piece is arranged in the piston cylinder, the piston assembly is elastically supported by the elastic piece, and the elastic piece is a spring 19. The main cylinder part comprises a main cylinder 12, the main piston 9 is arranged in the main cylinder 12 through an elastic supporting piece to form an air cavity and an oil cavity, and the main cylinder 12 is hermetically packaged through a main cylinder cover 11; the elastic support comprises a cone spring I8 and a cone spring II10, and the cone spring I8 and the cone spring II10 elastically restrain the main piston 9 in the main cylinder 12; the valve group comprises a valve seat 7, a steel ball 14 and a compression spring 18, wherein the valve seat 7 is abutted against the end part of a conical spring I8, and the steel ball 14 is arranged in the valve seat 7 through the compression spring 18.
The working process of the embodiment of the invention comprises the following steps: when a driver steps on a brake pedal, the push rod 1 and the piston 2 are forced to move, the push spring 19 is pushed to compress, and meanwhile, oil in the piston cylinder 5 is extruded to flow upwards through the leftmost oil hole; due to the sealing of the steel ball 14 and the valve seat 7, the oil cannot flow upwards from the second oil hole on the left at this time. At the same time, the conical spring I8 pushes the valve seat 7 downward, so that the oil flows into the cavity of the conical spring 8 from the leftmost oil hole through the gap between the valve seat 7 and the main cylinder 12. The main piston 9 then moves upwards, pushing the conical spring II10 to compress. When the driver releases the brake pedal, the main piston 9 and the piston 2 are reset due to the restoring action of the spring 19 and the conical spring II10, and the oil is driven to flow back. During fluid backward flow, can jack up steel ball 14 downwards, make steel ball 14 and disk seat 7 separation, consequently can follow two oilholes of piston cylinder 5 backward flow simultaneously during fluid backward flow, the inflow speed when the backward flow speed is greater than the braking far away has guaranteed brake pedal's followability. During braking, the spring 19, the conical spring I8 and the conical spring II10 have different acting time, the braking foot feeling of the traditional mechanical braking system is simulated in a grading manner, and the comfort of braking rigidity is ensured. And the graded brake pedal simulator is composed of a piston cylinder part and a main cylinder body part, has compact structure, small volume and high space utilization rate, and is beneficial to later-stage upgrading and updating.
Further, a sensor is arranged between the push rod and the brake pedal, and the sensor is used for detecting the displacement of the push rod 1 and feeding back a control signal to the electric brake system.
As shown in fig. 2, the sensor is a displacement sensor 21, and displacement monitoring is performed on the push rod 1 through the displacement sensor 21; as a brake signal of the electric brake system, the automation and intellectualization level of the electric brake system applying the graded brake pedal simulator are improved.
In addition, the other side wall of the main cylinder body is connected with an oil receiving pot 20, and the oil receiving pot 20 is used for maintaining oil in the piston cylinder within a set range, so that the influence of oil loss on the braking performance of the graded brake pedal simulator is avoided.
Referring to fig. 1, in another embodiment of the present invention, a medium passage corresponding to the oil hole is disposed at one end of the main cylinder body close to the oil liquid cavity; the main cylinder body is provided with an adjusting piece which penetrates through the side wall of the main cylinder body and extends into the medium channel, and the adjusting piece controls the oil passing amount of the medium channel.
Specifically, the medium passage with the oilhole matches, the regulating part can adopt choke valve 16, and 16 the end of choke valve passes the main cylinder body lateral wall and stretches into the medium passage, adjusts the speed that fluid advances in and goes out the oil liquid chamber through choke valve 16, and then adjusts the braking damping, guarantees that the brake feel suits with driver's shank, promotes and drives experience and comfort level.
Referring to fig. 1, in another preferred embodiment of the invention, the two contact surfaces of the piston and the piston cylinder are provided with sealing elements which are arranged in a staggered mode and used for sealing the piston cylinder.
The sealing parts are respectively a first sealing ring 3 and a second sealing ring 4, the first sealing ring 3 and the second sealing ring 4 are installed on two contact surfaces of the piston 2 and the piston cylinder 5 in a staggered mode, through the sealing of the first sealing ring 3 and the second sealing ring 4, oil in the piston cylinder cannot leak from the contact surfaces of the piston 2 and the piston cylinder 5, and meanwhile, the stability of brake hydraulic pressure is guaranteed.
Furthermore, sealing elements are respectively arranged at the joints of the main cylinder body, the main piston and the piston cylinder. The sealing elements are respectively a third sealing ring 13 at the joint of the main cylinder body 12 and the main piston 9, and an O-shaped sealing ring 6 at the joint of the main cylinder body and the piston cylinder; in addition, a fourth sealing ring 15 is arranged at the joint between the valve seat 7 and the inner cavity of the main cylinder body; a fifth sealing ring 17 is arranged at the joint of the main cylinder body and the throttle valve 16; the third sealing ring 13 is used for preventing oil in the oil cavity and air in the air cavity from leaking mutually; the O-shaped sealing ring 6, the fourth sealing ring 15 and the fifth sealing ring 17 are all used for preventing oil from leaking in the process of flowing between the piston cylinder and the main cylinder body.
Referring to fig. 3, in another embodiment of the present invention, a brake backup system is installed at an end of the piston cylinder portion away from the piston assembly, the piston assembly is moved to contact with a trigger portion of the brake backup system to trigger the brake backup system, and the brake backup system generates a braking force to brake the wheel after being triggered.
The brake backup system comprises a master brake cylinder 23 and a brake wheel cylinder 24 communicated with the master brake cylinder 23; a trigger push rod 22 is arranged at one end of the brake master cylinder 23 close to the master cylinder body, and the trigger push rod 22 is provided with a trigger part which is contacted with the push rod 1; when the displacement signal provided by the push rod 1 cannot generate effective braking force, a driver continuously steps on the brake pedal to enable the push rod 1 to continuously move leftwards, when the push rod 1 contacts the trigger push rod 22, the brake master cylinder 23 is triggered, and then the brake master cylinder 23 drives the four brake wheel cylinders 24 to work through the hydraulic pipeline, so that the four wheels all generate certain braking force; thereby ensuring the safety of people and vehicles.
The working principle of the invention is as follows: the number of the oil holes is two, and the valve group corresponds to a second oil hole in the left side of the piston cylinder 5; the piston assembly comprises a piston 2 and a push rod 1 integrally installed with the piston 2, one end, far away from a piston cylinder 5, of the push rod 1 is connected with a brake pedal, an elastic piece is arranged in the piston cylinder, the piston assembly is elastically supported by the elastic piece, and the elastic piece is a spring 19. The main cylinder part comprises a main cylinder 12, the main piston 9 is arranged in the main cylinder 12 through an elastic supporting piece to form an air cavity and an oil cavity, and the main cylinder 12 is hermetically packaged through a main cylinder cover 11; the elastic support comprises a cone spring I8 and a cone spring II10, and the cone spring I8 and the cone spring II10 elastically restrain the main piston 9 in the main cylinder 12; the valve group comprises a valve seat 7, a steel ball 14 and a compression spring 18, wherein the valve seat 7 is abutted against the end part of a conical spring I8, and the steel ball 14 is arranged in the valve seat 7 through the compression spring 18; when a driver steps on a brake pedal, the push rod 1 and the piston 2 are forced to move, the push spring 19 is pushed to compress, and meanwhile, oil in the piston cylinder 5 is extruded to flow upwards through the leftmost oil hole; due to the sealing of the steel ball 14 and the valve seat 7, the oil cannot flow upwards from the second oil hole on the left at this time. At the same time, the conical spring I8 pushes the valve seat 7 downward, so that the oil flows into the cavity of the conical spring 8 from the leftmost oil hole through the gap between the valve seat 7 and the main cylinder 12. The main piston 9 then moves upwards, pushing the conical spring II10 to compress. When the driver releases the brake pedal, the main piston 9 and the piston 2 are reset due to the restoring action of the spring 19 and the conical spring II10, and the oil is driven to flow back. During fluid backward flow, can jack up steel ball 14 downwards, make steel ball 14 and disk seat 7 separation, consequently can follow two oilholes of piston cylinder 5 backward flow simultaneously during fluid backward flow, the inflow speed when the backward flow speed is greater than the braking far away has guaranteed brake pedal's followability. During braking, the spring 19, the conical spring I8 and the conical spring II10 have different acting time, the braking foot feeling of the traditional mechanical braking system is simulated in a grading manner, and the comfort of braking rigidity is ensured. The emergency braking under the fault state is ensured through the arranged braking backup system, and the safety of people and vehicles is ensured.
It should be noted that the displacement sensor used in the present invention is an application of the prior art, and those skilled in the art can implement the intended function according to the related description, or implement the technical features required to be accomplished by the similar technology, and will not be described in detail herein.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (7)
1. A graduated brake pedal simulator, comprising:
the brake device comprises a piston cylinder part, a brake pedal part and a brake mechanism part, wherein the piston cylinder part is provided with a piston cylinder and a plurality of oil holes penetrating through the side wall of the piston cylinder;
the main cylinder body part is arranged on the side wall of the piston cylinder and communicated with the oil hole, a main piston is arranged in the main cylinder body part to form an air cavity and an oil liquid cavity, one end of the oil liquid cavity, which is close to the oil hole, is provided with a valve group, and the valve group controls the opening and closing of the oil hole of the part;
the brake pedal is stressed to push the piston assembly to move, and the piston assembly moves to extrude a medium in the piston cylinder to enter the oil liquid cavity through a part of oil holes; the medium in the oil cavity flows back to the piston cylinder through all the oil holes after the stress of the brake pedal is relieved;
the main cylinder part comprises a main cylinder, and the main piston is arranged in the main cylinder through an elastic supporting piece to form an air cavity and an oil cavity;
one end of the main cylinder body, which is close to the oil liquid cavity, is provided with a medium channel corresponding to the oil hole, the main cylinder body is provided with an adjusting piece which penetrates through the side wall of the main cylinder body and extends into the medium channel, and the adjusting piece controls the oil passing amount of the medium channel;
the elastic supporting piece comprises a conical spring I and a conical spring II, and the conical spring I and the conical spring II elastically restrain the main piston in the main cylinder body;
and the other side wall of the main cylinder body is connected with an oil receiving pot, and the oil receiving pot is used for maintaining oil in the piston cylinder within a set range and avoiding the influence of oil loss on the braking performance of the graded brake pedal simulator.
2. The graduated brake pedal simulator of claim 1, wherein the piston assembly comprises a piston and a push rod integrally mounted with the piston, the push rod being connected to the brake pedal at an end remote from the piston cylinder.
3. The graduated brake pedal simulator of claim 2, wherein a sensor is provided between the push rod and the brake pedal for sensing the displacement of the push rod and feeding back a control signal to the electric brake system.
4. The graduated brake pedal simulator of claim 2, wherein the piston and piston cylinder interface surfaces are offset to mount a seal that seals against the piston cylinder.
5. The graduated brake pedal simulator of claim 1, wherein a resilient member is disposed within the piston cylinder, the resilient member resiliently supporting the piston assembly.
6. The graduated brake pedal simulator of claim 1, wherein seals are provided at the junction of the main cylinder with the main piston and the piston cylinder, respectively.
7. The graduated brake pedal simulator of claim 1, wherein the end of the piston cylinder portion remote from the piston assembly mounts a brake back-up system, the piston assembly moving into contact with a trigger of the brake back-up system to trigger the brake back-up system.
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| CN202110212092.XA CN112849107B (en) | 2021-02-25 | 2021-02-25 | Hierarchical brake pedal simulator |
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| CN202110212092.XA CN112849107B (en) | 2021-02-25 | 2021-02-25 | Hierarchical brake pedal simulator |
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| CN112849107A CN112849107A (en) | 2021-05-28 |
| CN112849107B true CN112849107B (en) | 2022-03-08 |
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