CN111376879A

CN111376879A - Vehicle and brake control system thereof

Info

Publication number: CN111376879A
Application number: CN201811637804.7A
Authority: CN
Inventors: 任冲
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-07-07

Abstract

The brake control system adopts a travel sensor comprising a transmitter and at least one receiver, the transmitter and the receiver are connected with a brake controller, and the transmitter is arranged on a pedal surface on a brake pedal, so that the brake controller obtains the displacement of the brake pedal when a user treads the brake pedal according to the distance between the transmitter and the receiver and performs brake control on the vehicle according to the displacement of the brake pedal, thereby realizing accurate brake control of the vehicle, having low cost and unlimited pedal design, and further solving the problems of high cost or limited pedal design of the existing vehicle brake control method.

Description

Vehicle and brake control system thereof

Technical Field

The present disclosure relates to the field of vehicle technologies, and in particular, to a vehicle and a brake control system thereof.

Background

In recent years, with the application of vehicles in human life, the brake control performance of vehicles has become an important reference for the safety thereof. At present, in the prior art, an angle sensor is mainly arranged near a pedal arm rotating shaft, a rotating angle of a brake pedal is obtained through the angle sensor, and then the rotating angle is converted to obtain the displacement of the brake pedal, so that the vehicle is braked and controlled according to the displacement.

Although the method can realize vehicle brake control, the acquired rotation angle cannot obtain accurate pedal displacement, and particularly for an angle sensor with poor durability and a vehicle with a large angle in the use process, the acquired pedal displacement is deviated from the actual displacement of the brake pedal, so that the accuracy of the brake control is reduced.

In order to solve the above problems, the prior art has adopted a more durable sensor or has reduced the pedal rotation angle during actual use, however, the former increases the cost of the vehicle brake control, and the latter limits the design range of the pedal.

In summary, the existing vehicle brake control methods have the problems of high cost or limited pedal design.

Disclosure of Invention

The invention aims to provide a vehicle and a brake control system thereof, which aim to solve the problems of high cost or limited pedal design of the conventional vehicle brake control method.

The present disclosure is achieved in such a way, in a first aspect, a brake control system is provided for brake control of a vehicle, the brake control system includes a brake controller and a brake pedal, the brake control system further includes a stroke sensor, the stroke sensor includes a transmitter and at least one receiver, the transmitter and the receiver are both connected to the brake controller, the transmitter is disposed on a pedal surface of the brake pedal, and the brake controller obtains a brake pedal displacement when a user steps on the brake pedal according to a distance between the transmitter and the receiver, and performs brake control on the vehicle according to the brake pedal displacement.

A second aspect of the present disclosure provides a vehicle including the brake control system of the first aspect.

The brake control system adopts a travel sensor comprising a transmitter and at least one receiver, the transmitter and the receiver are connected with a brake controller, and the transmitter is arranged on a pedal surface of a brake pedal, so that the brake controller obtains the displacement of the brake pedal when a user treads the brake pedal according to the distance between the transmitter and the receiver and performs brake control on the vehicle according to the displacement of the brake pedal, thereby realizing accurate brake control of the vehicle, having low cost and unlimited pedal design, and further solving the problems of high cost or limited pedal design of the existing vehicle brake control method.

Drawings

To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.

FIG. 1 is a block diagram representation of a brake control system according to one embodiment of the present disclosure;

FIG. 2 is a schematic side view of a brake pedal of a brake control system according to an embodiment of the present disclosure;

FIG. 3 is a schematic front view of a brake pedal of a brake control system according to an embodiment of the present disclosure;

FIG. 4 is a block diagram of another brake control system provided in an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a pedal feel simulator of a brake control system according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

In order to explain the technical solution of the present disclosure, the following description is given by way of specific examples.

The disclosed embodiment provides a brake control system 100, and the brake control system 100 is used for brake control of a vehicle. As shown in fig. 1, the brake control system 100 includes a brake controller 101 and a brake pedal 102. As shown in fig. 2, the brake pedal 102 includes a pedal bracket 1, a brake lamp switch bracket 2, a brake lamp switch 3, a brake pedal arm 4 and a pedal surface 5, the pedal bracket 1 provides a mounting support for the brake pedal arm 4, the brake lamp switch 3 is mounted on the brake lamp switch bracket 2, and when a user, i.e., a driver, applies an input force to the pedal surface 5, the input force is amplified by the lever action of the brake pedal arm 4 and then acts on the entire brake pedal.

Specifically, with continued reference to fig. 1 and 2, as shown in fig. 1 and 2, the brake control system 100 further includes a travel sensor 103, the travel sensor 103 includes a transmitter 6 and at least one receiver (one is taken as an example in the figures), the transmitter 6 and the receiver are both connected to the brake controller 101, and the transmitter 6 is disposed on the tread surface 5 of the brake pedal 102. The brake controller 101 obtains the brake pedal displacement when the user steps on the brake pedal according to the distance between the transmitter 6 and the receiver, and then performs brake control on the vehicle according to the brake pedal displacement.

During specific implementation, the transmitter 6 and the receiver are both connected with the CAN network through the wiring harness and further connected with the brake controller 101 through the CAN network, so that the transmitter 6 and the receiver are respectively connected with the brake controller 101; in addition, the transmitter 6 and the at least one receiver may be implemented by an infrared transmitter and a receiver, and the present embodiment is not particularly limited.

In this embodiment, the stroke sensor 103 including the transmitter and the receiver is provided by the brake control system 100, so that the brake controller 101 can accurately obtain the brake pedal displacement when the user steps on the brake pedal 102 according to the distance between the transmitter and the receiver, and further the brake controller 101 can accurately control the braking of the vehicle according to the brake pedal displacement, and the cost is low, and meanwhile, the pedal design is not limited.

Further, during specific work, the transmitter 6 sends an electric signal to the outside according to a preset frequency, the sending time of the electric signal is fed back to the brake controller 101, the receiver receives the signal sent by the transmitter 6 and feeds back the receiving time to the brake controller 101, and the brake controller 101 obtains the distance between the transmitter 6 and the receiver according to the sending time and the receiving time of the electric signal; it should be noted that, in the embodiment of the present disclosure, the preset frequency may be set according to needs, and is not limited specifically here.

Further, the process of the brake controller 101 acquiring the distance between the transmitter and the receiver according to the sending time and the receiving time of the electrical signal is similar to the laser ranging method, that is, the process of the brake controller 101 acquiring the distance between the transmitter 6 and the receiver according to the sending time and the receiving time of the electrical signal is specifically as follows: the brake controller 101 obtains the transmission time of the electrical signal according to the sending time and the receiving time of the electrical signal, and further obtains the distance between the transmitter and the receiver according to the transmission time and the transmission speed of the signal.

After the controller 101 obtains the distance between the transmitter 6 and the receiver, the brake pedal displacement when the user steps on the brake pedal can be obtained according to the distance between the transmitter and the receiver, and then the brake deceleration can be calculated according to the brake pedal displacement, so that the vehicle is subjected to brake control according to the brake deceleration, that is, the four-wheel brake is controlled according to the brake deceleration, so that the four-wheel controller controls the vehicle to brake according to the brake deceleration, and the brake control of the vehicle is realized.

Further, as an embodiment of the present disclosure, as shown in fig. 3, the stroke sensor 103 includes three receivers, which are the receiver 7, the receiver 8 and the receiver 9, respectively, and the

receivers

7, 8 and 9 are disposed at three different positions of the pedal bracket 1, although it is understood by those skilled in the art that the

receivers

7, 8 and 9 may be disposed at any position on the vehicle other than the pedal bracket 1, and is not limited herein.

Further, during specific operation, the transmitter 6 sends an electric signal to the outside according to a preset frequency, and sends out time of the electric signal back to the brake controller 101, the plurality of

receivers

7, 8 and 9 receive the signal sent out by the transmitter 6, and sends out time of the signal back to the brake controller 101, the brake controller 101 obtains distances between the transmitter 6 and the

receivers

7, 8 and 9 according to the sending out time and the receiving time of the electric signal, and then obtains brake pedal displacement when a user steps on a brake pedal according to the distances between the transmitter 6 and the

receivers

7, 8 and 9.

When the controller 101 obtains the displacement of the brake pedal when the user steps on the brake pedal, the brake deceleration can be calculated according to the displacement of the brake pedal, and then the vehicle is subjected to brake control according to the brake deceleration, that is, the four-wheel brake is controlled according to the brake deceleration, so that the four-wheel controller controls the vehicle to brake according to the brake deceleration, and thus the brake control of the vehicle is realized.

In this embodiment, set up transmitter 6 on tread 5 to set up a plurality of receivers on pedal support 1's different positions, make transmitter 6 and receiver cooperation can acquire accurate brake pedal displacement, and then make controller 101 can realize the accurate braking control of vehicle according to this brake pedal displacement, security when having improved the vehicle braking.

The operation principle of the brake control system 100 provided by the embodiment of the present disclosure is specifically described below with reference to fig. 1 and 3, and is detailed as follows:

during specific operation, the transmitter 6 continuously sends out radio signals according to a certain frequency, and sends out time of the radio signals back to the brake controller 101, and the

receivers

7, 8, and 9 receive the radio signals sent out by the transmitter 6, and send out time of receiving the radio signals back to the brake controller 101, so that the brake controller 101 can obtain signal transmission time according to the difference between the sending out time and the receiving time of the electric signals, and further obtain the distance from each of the

receivers

7, 8, and 9 to the transmitter 6, that is, the distance between the transmitter 6 and the receiver 7, the distance between the transmitter 6 and the receiver 8, and the distance between the transmitter 6 and the receiver 9, according to the signal transmission time and the signal transmission speed.

After the brake controller 101 obtains the distances between the transmitter 6 and the

receivers

7, 8, and 9, the brake controller 101 may determine the position of the transmitter 6 on the entire vehicle according to the three-dimensional space calculation, so as to obtain the brake pedal displacement when the user steps on the brake pedal 102 according to the position.

Specifically, when the vehicle is shipped, the position of the tread surface 5 of the brake pedal 102 of each vehicle is calibrated through an initial position, that is, the position of the tread surface 5 of the brake pedal 102 at the time is known when the user does not step on the brake pedal 102, and the known position of the brake tread surface is marked as an initial point of the tread surface 5. When a user steps on the brake pedal 102, the position of the pedal surface 5 of the brake pedal 102 changes to different degrees along with the stepping action of the user, the change is sensed by the transmitter 6 and the

receivers

7, 8 and 9, and the sensing result is fed back to the brake controller 101, so that the brake controller 101 obtains the specific position of the pedal surface 5 when the user steps on the brake pedal 102, and then obtains the displacement of the brake pedal when the user steps on the brake pedal according to the difference between the initial point of the pedal surface 5 and the initial point of the pedal surface when the user steps on the brake pedal 102.

It should be noted that, in the embodiment of the present disclosure, the sensing result is a change in the distance between the transmitter 6 and the

receivers

7, 8, and 9, and the change in the distance between the transmitter 6 and the

receivers

7, 8, and 9 is characterized by the time required for receiving the signal; further, although the transmitter 6 also sends out an electric signal when the user does not step on the brake pedal, and the receiver also feeds back the reception time to the brake controller 101, since the pedal surface 5 of the brake pedal 102 is not changed at this time, the position of the pedal surface 5 of the brake pedal 102 acquired by the brake controller 101 is also the initial point position.

Further, after the brake controller 101 obtains the displacement of the brake pedal when the user steps on the brake pedal 102, the brake controller 101 performs differential calculation on the displacement of the brake pedal to obtain the brake deceleration, that is, the speed at which the brake pedal is stepped on, and further determines whether the driver performs emergency braking or general braking according to the speed at which the brake pedal is stepped on, so as to set the emergency braking function and the general braking function, and the four-wheel brake is controlled by the brake controller 101 to realize the emergency braking and the general braking of the vehicle.

It should be noted that, in this embodiment, since the transmitter 6 transmits the radio signal in real time, during the process that the user steps on the brake pedal, the brake pedal displacement obtained by the brake controller 101 is a displacement value that changes in real time, and the braking deceleration obtained according to the brake pedal displacement is also a speed value that changes in real time, and the degree of change of the speed value of the change can indicate that the user is currently performing emergency braking or slow braking, so that the brake controller 101 can perform accurate braking control on the vehicle according to the speed value that changes.

Further, as another embodiment of the present disclosure, as shown in fig. 4, the present disclosure also provides a brake control system 200, the brake control system 200 including a brake controller 101 and a brake pedal 102. The structure of the brake pedal 102 is the same as that of the brake pedal shown in fig. 1 to 3, and reference may be made to the related description of fig. 1 to 3, which is not repeated herein.

Specifically, referring to fig. 2 to 4, as shown in fig. 2 to 4, the brake control system 200 further includes a stroke sensor 103 and a force sensor 104. The specific composition structure, the setting position, the connection relationship with other devices in the brake control system 200, and the specific working process of the stroke sensor 103 are the same as those shown in fig. 1 to 3, and specific reference may be made to the related description of fig. 1 to 3, which is not repeated herein.

Further, a force sensor 104 is provided on the tread surface 5 of the brake pedal 102, and the force sensor 104 is connected to the brake controller 101, and the force sensor 104 acquires a tread force when the user treads on the brake pedal 102 and feeds back the tread force to the brake controller 101, so that the brake controller 104 performs brake control on the vehicle according to the brake pedal displacement and the tread force.

In specific implementation, after the brake controller 101 acquires the displacement of the brake pedal and the pedaling force when the user pedals the brake pedal, the brake controller 101 acquires a first brake deceleration according to the displacement of the brake pedal, acquires a second brake deceleration according to a pre-stored relationship curve of the pedaling force and the deceleration, and further acquires the brake deceleration of the vehicle according to the first brake deceleration and the second brake deceleration, so that the vehicle is controlled to brake according to the brake deceleration; note that, in the present embodiment, the brake controller 101 may obtain the brake deceleration from the average value of the first brake deceleration and the second brake deceleration, but is not limited thereto.

It should be noted that, in the brake control system 200 provided in the embodiment of the present disclosure, a series of processes of acquiring a first braking deceleration according to a displacement of the brake pedal obtained by the brake controller 101 through the travel sensor 103 when the user steps on the brake pedal, which is the same as that in the brake control system 100 shown in fig. 1 to 3, may specifically refer to the description of fig. 1 to 3, and are not repeated herein.

In this embodiment, the brake controller 101 controls the vehicle brake according to the tread force acquired by the force sensor 104 and the brake pedal displacement acquired by the stroke sensor 103, so that the vehicle brake is controlled according to the tread force and the displacement at the same time, the deceleration control of the vehicle is more accurate, and for a decoupled brake control system, the brake pedal performance is easier to match and calibrate, and the safety is higher.

Further, as an embodiment of the present disclosure, the brake controller 101 is further configured to perform fault detection on the pedal feel simulator according to the tread force and the brake pedal displacement when the user steps on the brake pedal 102.

In specific implementation, as shown in fig. 5, the pedal feel simulator is connected to a brake pedal 102 (not shown, refer to fig. 2 or fig. 3), and includes a U-shaped fork 10, a lock nut 11, a push rod 12, a push rod seat 13, a cylinder wall 14, a brake fluid 15, a spring seat 16, a spring 17, and other components. The brake pedal arm 4 (not shown, please refer to fig. 2) is connected to the U-shaped fork 10, the lock nut 11 is used for fixing the U-shaped fork 10 on the push rod 12, and the length of the push rod 12 can be adjusted by the position fixed by the U-shaped fork 10. The push rod 12 is connected with the push rod seat 13, the push rod seat 13 and the cylinder wall 14 can slide relatively and can realize sealing, and meanwhile, the spring seat 16 and the cylinder wall 14 can also slide relatively and can be sealed.

In addition, the push rod seat 13, the spring seat 16 and the cylinder wall 14 cooperate to form a chamber filled with brake fluid 15, which can be used to transmit pressure; one end of a spring 17 is connected with a spring seat 16, the other end of the spring 17 is connected with a cylinder wall 14, in the braking process, after a driver steps on a brake pedal, a brake pedal arm amplifies input force and transmits the amplified input force to a push rod 12 of a pedal simulator, the push rod 12 transmits the force to a push rod support 13, then the force is converted into brake fluid pressure, the brake fluid pressure is transmitted to the spring seat 16, the spring 17 is further compressed, the bearing pressure of the spring 17 after being compressed can provide force supporting feeling, and the required value of pedal force and stroke can be achieved by adjusting related variables such as the rigidity of the spring 17, the length of the spring 17, the ratio of the section area of the spring seat 16 to the section area of the push rod support 13, namely the pedal force and the pedal stroke are coordinated, so; it should be noted that, in the embodiment of the present disclosure, the stiffness of the spring 17, the length of the spring 17, the ratio of the cross-sectional area of the spring seat 16 to the cross-sectional area of the push rod support 13, and other related variables are adjusted to achieve the required value of the pedal force and the pedal stroke, that is, the specific process of coordinating the pedal force and the pedal stroke is the same as the implementation process of the existing pedal feel simulator, and reference may be made to the prior art specifically, and details are not described here.

As can be seen from the above description, since the pedal feel simulator coordinates the pedal force and the pedal stroke to more accurately control the braking of the vehicle, it is necessary to detect a failure state of the pedal feel simulator to confirm whether the pedal feel simulator is failed, so as to implement timely maintenance of the pedal feel simulator. Specifically, the brake controller 101 compares the acquired pedaling force with the displacement of the brake pedal, and if the pedaling force is not matched with the displacement of the brake pedal, it indicates that the pedal feel simulator fails, that is, if the pedaling force is large, the displacement of the brake pedal is small, or the pedaling force is small, and the displacement of the brake pedal is large, it indicates that the pedaling force is not matched with the displacement of the brake pedal, it indicates that the pedal feel simulator fails, and the displacement of the brake pedal is small when the pedaling force is small, or the displacement of the brake pedal is large when the pedaling force is large, it indicates that the pedaling force is matched with the displacement of the brake pedal, and at this time, it indicates that the pedal does not fail according to the simulator.

In this embodiment, a force sensor is arranged in the brake control system 100, so that the force sensor obtains the treading force of the user on the brake pedal, the brake controller 101 can conveniently detect the fault of the pedal simulation according to the treading force and the displacement of the brake pedal when the user treads the brake pedal, and timely learn whether the pedal breaks down according to the simulator, and then the pedal feeling simulator can be timely maintained, so that the potential safety hazard caused by the fault of the pedal feeling simulator can be eliminated.

Further, as an embodiment of the present disclosure, the force sensor 103 is integrated with the emitter 6 in one module.

In particular, the force sensor may be disposed on the tread surface 5 separately from the emitter 6, or the force sensor 103 and the emitter 6 may be integrated into a module, preferably the latter, so as to be disposed on the tread surface 5.

In the present embodiment, the force sensor and the transmitter 6 are integrated in one module and disposed on the tread surface, which improves the circuit integration of the brake control system 100 and reduces the footprint of the force sensor and the transmitter 6 on the tread surface.

Further, the present disclosure also provides a vehicle including the brake control system described above. It should be noted that, since the brake control system of the vehicle provided by the embodiment of the present disclosure is the same as the brake control system 100 shown in fig. 1 or the brake control system 200 shown in fig. 4, reference may be made to the foregoing detailed description about fig. 1 to fig. 4 for a specific working principle of the brake control system in the vehicle provided by the embodiment of the present disclosure, and details are not repeated here.

In the present disclosure, the vehicle provided by the present disclosure adopts the stroke sensor including the transmitter and the at least one receiver, connects the transmitter and the receiver with the brake controller, and sets the transmitter on the pedal surface on the brake pedal, so that the brake controller obtains the brake pedal displacement when the user steps on the brake pedal according to the distance between the transmitter and the receiver, and performs brake control on the vehicle according to the brake pedal displacement, thereby implementing accurate brake control of the vehicle, and the vehicle brake control method is low in cost and not limited in pedal design, thereby solving the problem that the existing vehicle brake control method is high in cost or limited in pedal design.

The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present disclosure, and are intended to be included within the scope of the present disclosure.

Claims

1. A brake control system is used for brake control of a vehicle and comprises a brake controller and a brake pedal and is characterized by further comprising a travel sensor, wherein the travel sensor comprises a transmitter and at least one receiver, the transmitter and the receiver are connected with the brake controller, the transmitter is arranged on a pedal face of the brake pedal, the brake controller obtains brake pedal displacement when a user steps on the brake pedal according to the distance between the transmitter and the receiver, and brake control is carried out on the vehicle according to the brake pedal displacement.

2. The brake control system according to claim 1, wherein the transmitter is provided on the tread surface, the transmitter externally transmits an electric signal at a predetermined frequency and feeds back a transmission time of the electric signal to the brake controller, the receiver receives the signal transmitted from the transmitter and feeds back a reception time to the brake controller, and the brake controller obtains a distance between the transmitter and the receiver based on the transmission time and the reception time of the electric signal.

3. The brake control system of claim 2, wherein the travel sensor includes three receivers disposed on the pedal bracket.

4. A brake control system according to any one of claims 1 to 3, characterized in that the brake controller is specifically configured to obtain a brake deceleration based on the brake pedal displacement, and to brake-control the vehicle based on the brake deceleration.

5. A brake control system according to any one of claims 1 to 3, further comprising a force sensor provided on the pedal surface and connected to the brake controller, the force sensor acquiring a depression force when a user depresses a brake pedal and feeding back the depression force to the brake controller, the brake controller performing brake control of a vehicle according to the brake pedal displacement and the depression force.

6. The brake control system according to claim 5, wherein the brake controller is specifically configured to acquire a first brake deceleration based on the brake pedal displacement, and acquire a second brake deceleration based on a prestored relationship curve of the depressing force and the deceleration, and acquire a brake deceleration of the vehicle based on the first brake deceleration and the second brake deceleration, so as to perform brake control on the vehicle based on the brake deceleration.

7. The brake control system according to claim 6, wherein the brake controller is further configured to perform failure detection of the pedal feel simulator based on the depression force and a displacement of the brake pedal when the user depresses the brake pedal.

8. The brake control system according to claim 7, wherein the brake controller is specifically configured to compare the pedaling force with a brake pedal displacement when the user depresses the brake pedal according to a preset pedal force-pedal displacement relationship curve, and identify that the pedal feel simulator is not faulty if the pedaling force matches the brake pedal displacement when the user depresses the brake pedal, and identify that the pedal feel simulator is faulty if the pedaling force does not match the brake pedal displacement when the user depresses the brake pedal.

9. A brake control system according to any one of claims 6 to 8, wherein the force sensor is integrated with the transmitter in one module.

10. A vehicle characterized in that the vehicle includes a brake control system according to any one of claims 1 to 9.