CN113135168A - Brake system - Google Patents

Brake system Download PDF

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Publication number
CN113135168A
CN113135168A CN202010064167.XA CN202010064167A CN113135168A CN 113135168 A CN113135168 A CN 113135168A CN 202010064167 A CN202010064167 A CN 202010064167A CN 113135168 A CN113135168 A CN 113135168A
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CN
China
Prior art keywords
brake pedal
hydraulic chamber
brake
pressure
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010064167.XA
Other languages
Chinese (zh)
Inventor
程鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to CN202010064167.XA priority Critical patent/CN113135168A/en
Publication of CN113135168A publication Critical patent/CN113135168A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B60T13/10—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 fluid assistance, drive, or release
    • B60T13/12—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 fluid assistance, drive, or release the fluid being liquid
    • 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
    • B60T13/10—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 fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • 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
    • 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
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

The application relates to a braking system comprising: a master cylinder including a primary hydraulic chamber disposed behind a brake pedal, a wheel cylinder, the primary hydraulic chamber being in fluid communication with the wheel cylinder, a pressure building unit in fluid communication with the wheel cylinder, and is configured to establish that a hydraulic pressure corresponding to the manipulation of the brake pedal is supplied to the brake wheel cylinder, and a brake pedal force feedback device configured to provide feedback of the brake pedal force when the brake pedal is depressed, wherein the brake pedal feedback means is in fluid communication with the primary hydraulic chamber and the wheel cylinder through a fluid branch that branches off from a branch point of a fluid passage between the primary hydraulic chamber and the wheel cylinder, wherein a check valve is provided in the fluid passage before the branch point, and a first on-off valve is provided in the fluid passage after the branch point, and, a second cut-off valve assembly is provided in a fluid passage between the pressure unit and the brake wheel cylinder.

Description

Brake system
Technical Field
The present invention relates to a brake device for a vehicle, and more particularly, to a brake system that improves safety in the event of a failure.
Background
The current vehicle brake system generally has a pressure building unit for providing hydraulic pressure to a brake cylinder to complete a braking process. However, if the pressure building unit fails, i.e., the pressure cannot be built up, if the hydraulic pressure is supplied to the wheel cylinders by only the master cylinder of the vehicle, this may make the vehicle unable to be safely braked and unable to meet the relevant standards of the industry. It is also costly to provide a separate fail-safe pressure build-up mechanism specifically for this purpose.
Disclosure of Invention
It is an object of the present application to solve or mitigate to some extent the problems of the prior art. In particular, the object of the present application is to achieve safe operation of the brake system in case of a failure of the pressure unit by simple modification with the mechanisms in existing brake systems.
According to an aspect of the present application, there is provided a brake system including:
a master cylinder including a primary hydraulic chamber disposed behind a brake pedal,
a wheel cylinder, the primary hydraulic chamber being in fluid communication with the wheel cylinder,
a pressure-building unit that is in fluid communication with the brake wheel cylinder and is configured to build up a hydraulic pressure corresponding to a manipulation of a brake pedal to be supplied to the brake wheel cylinder, an
A brake pedal force feedback device configured to provide feedback of brake pedal force when the brake pedal is depressed, wherein,
the brake pedal feedback device is in fluid communication with the primary hydraulic chamber and the wheel cylinder through a fluid branch that branches off from a branch point of a fluid passage between the primary hydraulic chamber and the wheel cylinder, wherein
A one-way valve is provided in the fluid passage before the branch point and a first on-off valve is provided in the fluid passage after the branch point, and,
a second cut-off valve assembly is provided in a fluid passage between the pressure-building unit and the brake wheel cylinder.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Moreover, in the drawings, like numerals are used to indicate like parts, and in which:
fig. 1 schematically illustrates a brake system disclosed herein.
Detailed Description
Referring to fig. 1, a brake system 100 according to the present disclosure includes a master cylinder 10, wheel cylinders 20, a brake pedal force feedback device 30, and a pressure buildup unit 40. Here, the pressure buildup unit 40 is configured to supply hydraulic pressure to the brake cylinders 20 based on manipulation of the brake pedal 200, that is, the braking force desired by the driver. Specifically, the master cylinder 10 includes a primary hydraulic chamber 11, and optionally, the master cylinder 10 may also include a secondary hydraulic chamber 12. The primary hydraulic pressure chamber 11 is provided behind the brake pedal 200, and causes the hydraulic pressure therein to be transmitted according to the depth/rate at which the brake pedal 200 is depressed, etc. Wherein the primary hydraulic pressure chamber 11 is in fluid communication with the wheel cylinders 20, and the pressure-building unit 40 is also in fluid communication with the wheel cylinders 20. The brake pedal force feedback means 30 may provide feedback of the brake pedal force when the brake pedal 200 is depressed, and the brake pedal force feedback means 30 is in fluid communication with the primary hydraulic chamber 11 and the wheel cylinder 20 through a fluid branch that branches from a branch point of a fluid passage between the primary hydraulic chamber 11 and the wheel cylinder 20. Further, in the brake system 100 disclosed in the present application, the check valve 50 is provided in the fluid passage before the branch point, and the first cut-off valve 60 is provided in the fluid passage after the branch point, and the second cut-off valve assembly is provided in the fluid passage between the pressure unit 40 and the wheel cylinder 20, which valve structures enable the hydraulic pressure to be transmitted to a desired mechanism under different conditions.
In the brake system 100 disclosed in some embodiments of the present application, the master cylinder 10 further includes a secondary hydraulic chamber 12 disposed behind the primary hydraulic chamber 11, as in the related art. Further, a third shut-off valve 70 is provided in a fluid passage between the secondary hydraulic pressure chamber 12 and the wheel cylinder 20.
In the brake system 100 disclosed in the present application, in the case where the pressure unit 40 is normally operated, when the brake pedal 200 is depressed, as shown in fig. 1, the check valve 50 is opened, and the first and third on-off valves 60 and 70 are closed, which enables the hydraulic pressure to be transmitted from the primary hydraulic chamber 11 of the master cylinder 10 to the brake pedal force feedback device 30. That is, in this case, the brake pedal force feedback device 30 is used to provide the driver with feedback of the brake pedal force based on the operation of the brake pedal 200. In particular, based on the effect of the brake pedal force feedback device 30, in the context of the present application, the brake pedal force feedback device 30 comprises a hydraulic chamber and a piston 31, an elastic element 32 and an electric motor 33 associated therewith. Here, the elastic element 32 is arranged longitudinally, i.e. along the longitudinal axis of the hydraulic chamber, between the piston and the motor 33, so that it can be compressed or extended by the motor 33 and the piston, respectively, exerting a force thereon. When the brake pedal 200 is depressed, the hydraulic pressure in the master cylinder 10 is compressed and transmitted to the hydraulic chamber of the brake pedal force feedback device 30, for example, through the primary hydraulic cylinder, so that the hydraulic pressure in the hydraulic chamber increases and pushes the piston to move to compress the elastic member 32. The hydraulic pressure transmitted from the master cylinder 10 into the hydraulic chamber is determined depending on the actuation of the brake pedal 200, that is to say in particular including the depth and/or rate at which the brake pedal 200 is depressed.
During the depression of the brake pedal 200, since the elastic member 32 is compressed, the motor 33 connected to the elastic member 32 can output a force based on the manipulation of the brake pedal 200. The force output by the motor 33 can act on the elastic element 32 such that the amount by which the elastic element 32 is compressed by the piston is compensated. It can be provided here that the amount of expansion and contraction of the elastic element 32 is compensated so that the amount by which it is compressed by the piston is fully restored.
In the above-described case, it can be determined that the elastic element 32 is compressed by the piston when the brake pedal 200 is depressed, and the motor 33 needs to be reversed, that is, retracted by a certain amount with respect to the elastic element 32 in order to compensate for the amount of compression of the elastic element 32, so that the amount of compression of the elastic element 32 can be compensated.
Here, the force output by motor 33 depends on the depth and/or rate at which brake pedal 200 is depressed and other variables at which brake pedal 200 is manipulated. That is, the motor 33 may be calibrated in advance, with different pedal depths and/or speeds corresponding to different motor 33 speeds or output torques. That is, the deeper the brake pedal 200 is depressed, the greater the amount of reverse retraction of the motor 33 is required, and the faster the brake pedal 200 is depressed, the greater the force provided by the reverse rotation of the motor 33. So that the brake pedal feedback feeling available to the driver is adjusted depending on the situation in which the brake pedal 200 is operated.
The spring element 32 can be designed as an integral spring. On the basis of this, the spring can be arranged longitudinally in the hydraulic chamber and guided by the hydraulic chamber, as is shown in fig. 1. Further, a guide piston is arranged in the hydraulic chamber at the end of the spring facing away from the piston to guide the movement of the spring in the hydraulic chamber. The motor 33 is connected to the spring by means of a guide piston. It can also be provided that a spring is arranged between the piston and the motor 33 with a preload. This arrangement can more improve the feedback feeling of the driver when stepping on the brake pedal 200.
In the brake system 100 disclosed in the present application, in the event of a failure of the pressure building unit 40, the brake pedal force feedback device 30 may supply the hydraulic pressure to the wheel cylinders 20 as the auxiliary pressure building unit 40 in the event of a failure. In this case, the check valve 50 and the second cut-off valve assembly are closed, and the first cut-off valve 60 and the third cut-off valve 70 are opened, so that the hydraulic pressure can be supplied from the brake pedal force feedback device and the secondary hydraulic pressure chamber 12 into the wheel cylinders 20.
Specifically, when the pressure unit 40 fails, the motor 33 may output torque to satisfy the lowest braking force demand of the brake system 100, so that the hydraulic pressure chamber in the brake pedal force feedback device 30 is compressed, thereby supplying hydraulic pressure to the wheel cylinders 20. It is of course also possible to design the motor 33 to output a desired torque to meet a desired braking force corresponding to the brake pedal 200 based on the situation in which the brake pedal 200 is actuated, including, for example, the depth and/or rate at which the brake pedal 200 is depressed. That is, in such a failure situation, the hydraulic pressure of the brake wheel cylinders 20 can be supplied from the secondary hydraulic chamber 12 and the hydraulic chamber of the brake pedal force feedback device 30 at the same time, which ensures that the brake system 100 can be supplied with a sufficient braking force even when the pressure unit 40 fails.
In the scope of the present application, the failure of the pressure building unit 40 includes all failures that cause the pressure building unit 40 to be unable to normally supply hydraulic pressure.
Further, in some embodiments disclosed herein, as shown in fig. 1, the pressure building unit 40 may be in fluid communication with the wheel cylinders 20 through fluid branches branched from other branch points of the fluid passage between the primary hydraulic chamber 11 and the wheel cylinders 20, and fluid branches branched from branch points of the fluid passage between the secondary hydraulic chamber 12 and the wheel cylinders 20, respectively, wherein the second cut-off valve assembly also includes two cut-off valves provided in the above-described two fluid branches, respectively. In this case, it can be provided that a branching point of the primary hydraulic chamber 11 for the pressure buildup unit 40 is arranged downstream of the first shut-off valve 60.

Claims (15)

1. A braking system (100), comprising:
a master cylinder (10) including a primary hydraulic chamber (11), the primary hydraulic chamber (11) being disposed behind a brake pedal (200),
a brake cylinder (20), the primary hydraulic chamber (11) being in fluid communication with the brake cylinder (20),
a pressure-building unit (40), the pressure-building unit (40) being in fluid communication with the wheel cylinders (20) and configured to build up a hydraulic pressure corresponding to a manipulation of a brake pedal (200) to be supplied to the wheel cylinders (20), and
a brake pedal force feedback device (30) configured to provide brake pedal force feedback when the brake pedal (200) is depressed, wherein,
the brake pedal feedback device is in fluid communication with the primary hydraulic chamber (11) and the brake cylinder (20) through a fluid branch that branches off from a branch point of a fluid passage between the primary hydraulic chamber (11) and the brake cylinder (20), wherein
A one-way valve (50) is arranged in the fluid passage before the branching point and a first on-off valve (60) is arranged in the fluid passage after the branching point, and,
a second cut-off valve assembly (80) is provided in a fluid passage between the pressure-building unit (40) and the brake cylinder (20).
2. The brake system (100) according to claim 1, wherein the master cylinder (10) further includes a secondary hydraulic chamber (12) disposed behind the primary hydraulic chamber (11), wherein a third shut-off valve (70) is provided in a fluid passage between the secondary hydraulic chamber (12) and the wheel cylinder (20).
3. The brake system (100) according to claim 2, wherein, in the event of a failure of the pressure buildup unit (40), the check valve (50) and the second cut-off valve assembly (80) are closed, and the first cut-off valve (60) and the third cut-off valve (70) are opened, so that the hydraulic pressure is supplied to the wheel cylinders (20) from the brake pedal force feedback device (30) and from the secondary hydraulic pressure chamber (12).
4. The braking system (100) of claim 3, wherein the brake pedal force feedback device (30) comprises:
a hydraulic chamber and a piston (31) associated therewith, wherein the hydraulic chamber is in fluid communication with a primary hydraulic chamber (11) of the master cylinder (10) via the one-way valve (50);
a motor (33); and
an elastic element (32), the elastic element (32) being longitudinally arranged between the piston and the motor (33), wherein the elastic element (32) is acted upon longitudinally by the motor (33) and the piston.
5. The brake system (100) according to claim 4, wherein, in the event of a failure of the pressure buildup unit (40), the motor (33) drives the hydraulic chamber based on manipulation of the brake pedal (200) so that the hydraulic chamber supplies hydraulic pressure to the wheel cylinders (20).
6. The brake system (100) according to claim 4, wherein, in the brake pedal force feedback device (30), when the pressure build-up unit (40) is not malfunctioning,
the hydraulic pressure in the hydraulic chamber is regulated depending on the manipulation of a brake pedal (200), and the piston is moved along a chamber wall of the hydraulic chamber pushed by the hydraulic pressure when the brake pedal (200) is depressed;
the motor (33) outputs a force based on manipulation of the brake pedal (200); and
the elastic element (32) is acted upon longitudinally by the motor (33) and the piston and is compressed by the piston when the brake pedal (200) is depressed.
7. The braking system (100) according to claim 5 or 6, characterized in that the manipulation of the brake pedal (200) comprises a depth at which the brake pedal (200) is depressed and/or a rate at which the brake pedal (200) is depressed.
8. A braking system (100) according to claim 6, characterized in that during depression of said brake pedal (200), said one-way valve (50) is open and said first on-off valve (60) and said third on-off valve (70) are closed, said motor (33) exerting a force on said elastic element (32) until the amount of compression of said elastic element (32) by said piston is compensated.
9. The brake system (100) according to claim 6, characterized in that the elastic element (32) is designed as an integral spring.
10. The brake system (100) according to claim 9, wherein the spring is arranged with a pretension between the piston and the motor (33).
11. The braking system (100) of claim 10, wherein the spring is disposed longitudinally in and guided by the hydraulic chamber.
12. Braking system (100) according to claim 11, characterized in that in the hydraulic chamber, at the end of the spring facing away from the piston, a guide piston is arranged, through which the spring is connected to the electric motor (33).
13. The braking system (100) according to claim 3, wherein the failure of the voltage building unit (40) comprises:
the pressure building unit (40) cannot normally build hydraulic pressure.
14. The brake system (100) according to claim 2, wherein the pressure-building unit (40) is in fluid communication with the wheel cylinders (20) through fluid branches that branch off from other branch points of the fluid passage between the primary hydraulic chamber (11) and the wheel cylinders (20), and fluid branches that branch off from branch points of the fluid passage between the secondary hydraulic chamber (12) and the wheel cylinders (20), respectively, wherein the second cut-off valve assembly (80) includes two cut-off valves that are provided in the above two fluid branches, respectively.
15. The brake system (100) according to claim 8, wherein the further branch point is arranged after the first on-off valve (60).
CN202010064167.XA 2020-01-20 2020-01-20 Brake system Pending CN113135168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010064167.XA CN113135168A (en) 2020-01-20 2020-01-20 Brake system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010064167.XA CN113135168A (en) 2020-01-20 2020-01-20 Brake system

Publications (1)

Publication Number Publication Date
CN113135168A true CN113135168A (en) 2021-07-20

Family

ID=76809682

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010064167.XA Pending CN113135168A (en) 2020-01-20 2020-01-20 Brake system

Country Status (1)

Country Link
CN (1) CN113135168A (en)

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