CN110641428A - Vehicle braking system and method for acquiring stroke of brake pedal - Google Patents
Vehicle braking system and method for acquiring stroke of brake pedal Download PDFInfo
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- CN110641428A CN110641428A CN201810706132.4A CN201810706132A CN110641428A CN 110641428 A CN110641428 A CN 110641428A CN 201810706132 A CN201810706132 A CN 201810706132A CN 110641428 A CN110641428 A CN 110641428A
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- brake pedal
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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
- B60T7/04—Brake-action initiating means for personal initiation foot actuated
- B60T7/06—Disposition of pedal
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- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention provides a vehicle braking system and a method for acquiring brake pedal stroke, which are used for acquiring the corresponding relation between the brake pedal stroke of a vehicle in which the vehicle braking system is positioned and the pressure of a brake master cylinder; acquiring the pressure of a brake master cylinder of a vehicle; and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation. On the basis of not changing the traditional vehicle type braking system, the output of the stroke of the brake pedal is realized, and the manufacturing cost of the vehicle is saved.
Description
Technical Field
The invention relates to the field of vehicle brake control, in particular to a vehicle brake system and a method for acquiring the stroke of a brake pedal.
Background
The existing 48V BRS (energy recovery system) has advanced functions of accelerating assistance, energy recovery and the like, and the improvement of the dynamic property and the economical efficiency of the vehicle can be realized at low cost by modifying the 48V BRS system on the conventional vehicle.
A traditional vehicle usually adopts a vehicle controller (ECU) to sense an on-off brake signal, and in the braking energy recovery function of a 48V BRS system, the on-off brake signal sensed by the vehicle controller (ECU) cannot be applied, if the 48V BRS system needs to be modified on a conventional vehicle, a brake stroke sensor needs to be added to quantify the braking intention of a driver, so that the motor can be controlled to recover energy, the ECU judges the driving state of the vehicle by collecting the brake pedal stroke signal and the accelerator pedal signal of the brake stroke sensor, and the motor is controlled to recover energy and assist. However, the cost of manufacturing the vehicle is further increased.
Disclosure of Invention
The invention aims to provide a vehicle braking system and a method for acquiring the stroke of a brake pedal, and aims to solve the problems that in the prior art, the cost is high when a 48V BRS system is modified on a traditional vehicle.
In order to achieve the above object, the present invention provides a vehicle braking system provided on a vehicle, the vehicle braking system including a vehicle body stabilizing unit and a vehicle control unit;
the vehicle body stabilizing unit is used for acquiring the pressure of a brake master cylinder of the vehicle;
the vehicle control unit comprises a corresponding relation between the stroke of the brake pedal and the pressure of the brake master cylinder, and the vehicle control unit is used for obtaining the stroke of the brake pedal of the vehicle according to the corresponding relation and the pressure of the brake master cylinder of the vehicle.
Optionally, the vehicle body stabilizing unit includes a brake master cylinder and a detecting unit, brake fluid is provided in the brake master cylinder, and when the brake fluid is forced to press the brake master cylinder, the detecting unit detects the pressure of the brake master cylinder and outputs a pressure signal.
Optionally, the detection unit further outputs a judgment flag for judging whether the pressure signal is valid.
Optionally, the judgment flag is represented by a binary code.
Optionally, when the determination flag is 0, the pressure signal is valid, and when the determination flag is 1, the pressure signal is invalid; or, when the judgment flag is 1, the pressure signal is valid, and when the judgment flag is 0, the pressure signal is invalid.
Optionally, the vehicle control unit obtains the pressure signal and the determination flag, and determines whether the pressure signal is valid according to the determination flag, and when the pressure signal is valid, the vehicle control unit converts the pressure of a brake master cylinder of the vehicle in which the vehicle is located into a brake pedal stroke of the vehicle in which the vehicle is located according to the pressure signal and the corresponding relationship; and when the pressure signal is invalid, replacing the pressure of a brake master cylinder of the vehicle with a threshold value, and converting the threshold value into the stroke of a brake pedal of the vehicle.
Optionally, the vehicle control unit further determines whether the stroke of the brake pedal of the vehicle is valid, and outputs a stroke signal when the stroke of the brake pedal of the vehicle is valid, where the stroke signal is used to determine the driving state of the vehicle, and determine whether to perform braking energy recovery and determine the amount of energy recovery.
The invention also provides a method for acquiring the stroke of the brake pedal, which comprises the following steps:
providing the vehicle braking system;
acquiring the corresponding relation between the stroke of a brake pedal of a vehicle where the vehicle brake system is located and the pressure of a brake master cylinder;
acquiring the pressure of a brake master cylinder of the vehicle;
and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation.
Optionally, obtaining the corresponding relationship between the stroke of the brake pedal of the vehicle and the pressure of the brake master cylinder includes:
obtaining the brake pedal travel and the brake master cylinder pressure of a plurality of vehicles of the same type as the vehicle;
and obtaining the corresponding relation between the brake pedal stroke of the vehicle and the pressure of the brake master cylinder according to the obtained brake pedal stroke and the pressure of the brake master cylinder.
Optionally, the vehicle body stabilizing unit obtains the pressure of the brake master cylinder and outputs the pressure signal, and the vehicle body stabilizing unit further outputs a judgment mark for judging whether the pressure signal is valid.
Optionally, the judgment flag is represented by a binary code.
Optionally, when the determination flag is 0, the pressure signal is valid, and when the determination flag is 1, the pressure signal is invalid; or, when the judgment flag is 1, the pressure signal is valid, and when the judgment flag is 0, the pressure signal is invalid.
Optionally, obtaining the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relationship comprises:
the vehicle control unit acquires the pressure signal and the judgment mark, judges whether the pressure signal is effective or not according to the judgment mark, and converts the pressure of a brake master cylinder of the vehicle into the stroke of a brake pedal of the vehicle according to the pressure signal and the corresponding relation when the pressure signal is effective; and when the pressure signal is invalid, replacing the pressure of a brake master cylinder of the vehicle with a threshold value, and converting the threshold value into the stroke of a brake pedal of the vehicle.
Optionally, after acquiring the stroke of the brake pedal of the vehicle, the vehicle control unit determines whether the stroke of the brake pedal of the vehicle is valid, and outputs a stroke signal when the stroke of the brake pedal of the vehicle is valid, where the stroke signal is used to determine the driving state of the vehicle, and determine whether to perform braking energy recovery and determine the amount of energy recovery.
Optionally, the range of the master cylinder pressure includes 0bar to 100 bar.
Optionally, the range of the brake pedal travel includes 0-100%.
In the vehicle braking system and the method for acquiring the stroke of the brake pedal provided by the invention, the corresponding relation between the stroke of the brake pedal of a vehicle where the vehicle braking system is located and the pressure of a brake master cylinder is acquired; acquiring the pressure of a brake master cylinder of a loaded vehicle; and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation. On the basis of not changing the traditional vehicle type braking system, the output of the stroke of the brake pedal is realized, the manufacturing cost of the vehicle is saved, and the braking system is simplified.
Drawings
FIG. 1 is a flowchart of a method for obtaining brake pedal travel according to an exemplary embodiment;
FIG. 2 is a schematic diagram of the corresponding relationship between the brake pedal stroke and the master cylinder pressure provided by the embodiment;
FIG. 3 is a flowchart of a method for obtaining brake pedal travel according to an embodiment.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. Advantages and features of the present invention will become apparent from the following description and claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The embodiment provides a vehicle braking system, which is arranged on a vehicle and comprises a vehicle body stabilizing unit and a vehicle control unit; the vehicle body stabilizing unit is used for acquiring the pressure of a brake master cylinder of the vehicle; the vehicle control unit comprises a corresponding relation between the stroke of the brake pedal and the pressure of the brake master cylinder, and the vehicle control unit is used for obtaining the stroke of the brake pedal of the vehicle according to the corresponding relation and the pressure of the brake master cylinder of the vehicle. On the basis of not changing the traditional vehicle braking system, the output of the stroke of the brake pedal is realized, the vehicle manufacturing cost is saved, and the braking system is simplified.
Specifically, the vehicle body stability program (ESP) of the vehicle brake system includes a brake master cylinder in which a brake fluid is provided, and a detection unit that can measure a pressure of the brake fluid in the brake master cylinder and output the pressure signal, and the pressure of the brake fluid in the brake master cylinder can directly reflect a driver's will to decelerate the vehicle (i.e., a brake pedal stroke), so that the relationship between the brake master cylinder pressure and the brake pedal stroke is very close.
The brake master cylinder can be made of elastic materials, when a brake pedal is stepped on, brake fluid in the brake master cylinder is stressed and presses the brake master cylinder, at the moment, the detection unit detects the pressure of the brake master cylinder, the detection unit can be specifically a pressure sensor unit, and the pressure sensor unit obtains the pressure of the brake master cylinder and converts the pressure of the brake master cylinder into a pressure signal to be output.
Referring to fig. 1, which is a flowchart illustrating a method for obtaining a brake pedal stroke according to an embodiment of the present invention, as shown in fig. 1, the method for obtaining a brake pedal stroke includes:
s1: providing the vehicle braking system;
s2: acquiring the corresponding relation between the stroke of a brake pedal of a vehicle where the vehicle brake system is located and the pressure of a brake master cylinder;
s3: acquiring the pressure of a brake master cylinder of the vehicle;
s4: and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation.
With continuing reference to fig. 2-3, the method for obtaining the stroke of the brake pedal according to the present embodiment will be further described with reference to fig. 2-3.
Referring to fig. 2, the vehicle with the vehicle brake system is adopted to calibrate the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle of the type, and then the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle with the vehicle brake system is obtained through fitting, and the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle with the vehicle brake system can be clearly obtained through the fitting curve in fig. 2. Specifically, for example, the vehicle where the vehicle braking system is located is a first type vehicle, and the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle where the vehicle is located is obtained, where the corresponding relationship is the corresponding relationship of the first type vehicle, and when the vehicle type is changed, the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle of this type may be calibrated by using the vehicle of this type again, for example, the vehicle where the vehicle braking system is located is a second type vehicle, and the corresponding relationship between the brake pedal stroke and the brake master cylinder pressure of the vehicle of the second type may be calibrated by using the vehicle of the second type. Further, when the corresponding relation between the brake pedal stroke of the vehicle and the pressure of the brake master cylinder is calibrated, multiple vehicles of the same type as the vehicle can be calibrated for multiple times to obtain more accurate corresponding relation between the brake pedal stroke and the pressure of the brake master cylinder, and the corresponding relation between the brake pedal stroke of the vehicle and the pressure of the brake master cylinder is obtained according to the obtained brake pedal stroke and the pressure of the brake master cylinder by obtaining the brake pedal stroke and the pressure of the brake master cylinder of the vehicle, so that the corresponding relation between the brake pedal stroke and the pressure of the brake master cylinder is closer to the real condition.
As shown in fig. 2, the master cylinder pressure ranges from 0bar to 100bar, for example, 20bar, 40bar, 60bar, 80bar, and 100bar, and the greater the master cylinder pressure, the greater the brake pedal stroke, i.e., the greater the depth of the brake pedal. The stroke of the brake pedal is changed between 0 percent and 100 percent and corresponds to a state from a non-treading state to a treading state. It is to be understood that fig. 2 shows only the correspondence between the brake pedal stroke and the master cylinder pressure for a certain type of vehicle.
Referring to fig. 3, the vehicle control unit obtains a master cylinder pressure of the vehicle, converts the master cylinder pressure into a pressure signal, and outputs the pressure signal, and the vehicle body stabilizing unit further outputs a determination flag for determining whether the pressure signal is valid, for example: when the pressure sensor unit itself fails, the pressure signal is invalid. Specifically, the determination flag may be represented by a binary signal (including "0" and "1"), and when the determination flag is "0", the pressure signal is valid, and when the determination flag is "1", the pressure signal is invalid; or, when the judgment flag is "1", the pressure signal is valid, and when the judgment flag is "0", the pressure signal is invalid. The type of the judgment flag may be any one of the prior art, and the present invention is not limited thereto.
The vehicle control unit (ECU) acquires the pressure signal and the judgment mark, judges whether the pressure signal is effective or not through the judgment mark (when the pressure sensor unit breaks down, the pressure signal is invalid; when the pressure sensor works normally, the pressure signal is effective), and when the pressure signal is effective, the vehicle control unit (ECU) acquires the brake pedal stroke of the vehicle according to the brake master cylinder pressure of the vehicle and the corresponding relation between the brake pedal stroke and the brake master cylinder pressure in the graph 2; when the pressure signal is invalid, the vehicle control unit (ECU) replaces the master cylinder pressure with a threshold value, and obtains a brake pedal stroke corresponding to the threshold value, for example: the pressure of the brake master cylinder when the pressure signal is invalid is replaced by 0bar, so that the reliability of the pressure signal of the brake master cylinder is improved, and the safety performance of a brake system is improved.
Next, the vehicle control unit (ECU) determines whether the brake pedal stroke is valid again, and when the brake pedal stroke is valid, the vehicle control unit (ECU) outputs a stroke signal, and when the brake pedal stroke is invalid, the vehicle control unit (ECU) does not output the stroke signal to avoid a malfunction. The travel signal carries travel information of the brake pedal, and can be used for judging the running state of the vehicle and controlling whether the motor of the vehicle carries out energy recovery and assistance and the energy recovery.
In summary, in the vehicle braking system and the method for obtaining the stroke of the brake pedal provided by the embodiment of the invention, the corresponding relationship between the stroke of the brake pedal of the vehicle where the vehicle braking system is located and the pressure of the brake master cylinder is obtained in the vehicle braking system and the method for obtaining the stroke of the brake pedal provided by the invention; acquiring the pressure of a brake master cylinder of a loaded vehicle; and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation. On the basis of not changing the traditional vehicle type braking system, the output of the stroke of the brake pedal is realized, the manufacturing cost of the vehicle is saved, and the braking system is simplified.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (16)
1. A vehicle braking system is arranged on a vehicle and is characterized by comprising a vehicle body stabilizing unit and a vehicle control unit;
the vehicle body stabilizing unit is used for acquiring the pressure of a brake master cylinder of the vehicle;
the vehicle control unit comprises a corresponding relation between the stroke of the brake pedal and the pressure of the brake master cylinder, and the vehicle control unit is used for obtaining the stroke of the brake pedal of the vehicle according to the corresponding relation and the pressure of the brake master cylinder of the vehicle.
2. The vehicle brake system according to claim 1, wherein the vehicle body stabilizing unit includes a master cylinder in which a brake fluid is provided, and a detecting unit that detects a pressure of the master cylinder and outputs a pressure signal when the brake fluid is forcibly pressed against the master cylinder.
3. The vehicle braking system according to claim 2, wherein the detection unit further outputs a determination flag for determining whether the pressure signal is valid.
4. A vehicle braking system according to claim 3 wherein the decision flags are represented by a binary code.
5. The vehicle brake system according to claim 4, wherein the pressure signal is valid when the determination flag is 0, and the pressure signal is invalid when the determination flag is 1; or, when the judgment flag is 1, the pressure signal is valid, and when the judgment flag is 0, the pressure signal is invalid.
6. The vehicle braking system according to claim 3, wherein the vehicle control unit acquires the pressure signal and the judgment flag, judges whether the pressure signal is valid according to the judgment flag, and when the pressure signal is valid, the vehicle control unit converts the pressure of a brake master cylinder of the vehicle into the stroke of a brake pedal of the vehicle according to the pressure signal and the corresponding relation; and when the pressure signal is invalid, replacing the pressure of a brake master cylinder of the vehicle with a threshold value, and converting the threshold value into the stroke of a brake pedal of the vehicle.
7. The vehicle braking system according to claim 6, wherein the vehicle control unit further determines whether the travel of the brake pedal of the vehicle is effective, and outputs a travel signal when the travel of the brake pedal of the vehicle is effective, wherein the travel signal is used for determining the driving state of the vehicle and determining whether to perform braking energy recovery and the energy recovery.
8. A method of obtaining a brake pedal travel, the method comprising:
providing a vehicle braking system according to any one of claims 1 to 7;
acquiring the corresponding relation between the stroke of a brake pedal of a vehicle where the vehicle brake system is located and the pressure of a brake master cylinder;
acquiring the pressure of a brake master cylinder of the vehicle;
and acquiring the stroke of the brake pedal of the vehicle according to the pressure of the brake master cylinder of the vehicle and the corresponding relation.
9. The method of obtaining brake pedal travel according to claim 8, wherein obtaining a correspondence relationship between brake pedal travel of a vehicle and master cylinder pressure comprises:
obtaining the brake pedal travel and the brake master cylinder pressure of a plurality of vehicles of the same type as the vehicle;
and obtaining the corresponding relation between the brake pedal stroke of the vehicle and the pressure of the brake master cylinder according to the obtained brake pedal stroke and the pressure of the brake master cylinder.
10. The method of acquiring a brake pedal stroke according to claim 8, wherein the body stabilizing unit acquires the master cylinder pressure and outputs the pressure signal, and the body stabilizing unit further outputs a determination flag for determining whether the pressure signal is valid.
11. The method of claim 10, wherein the decision flag is represented by a binary code.
12. The method of claim 11, wherein the pressure signal is active when the determination flag is 0 and inactive when the determination flag is 1; or, when the judgment flag is 1, the pressure signal is valid, and when the judgment flag is 0, the pressure signal is invalid.
13. The method for obtaining the brake pedal stroke according to claim 12, wherein obtaining the brake pedal stroke of the vehicle according to the master cylinder pressure of the vehicle and the correspondence relationship comprises:
the vehicle control unit acquires the pressure signal and the judgment mark, judges whether the pressure signal is effective or not according to the judgment mark, and converts the pressure of a brake master cylinder of the vehicle into the stroke of a brake pedal of the vehicle according to the pressure signal and the corresponding relation when the pressure signal is effective; and when the pressure signal is invalid, replacing the pressure of a brake master cylinder of the vehicle with a threshold value, and converting the threshold value into the stroke of a brake pedal of the vehicle.
14. The method for acquiring the stroke of the brake pedal as claimed in claim 13, wherein the vehicle control unit judges whether the stroke of the brake pedal of the vehicle is valid after acquiring the stroke of the brake pedal of the vehicle, and outputs a stroke signal when the stroke of the brake pedal of the vehicle is valid, wherein the stroke signal is used for judging the driving state of the vehicle and determining whether to perform braking energy recovery and the energy recovery.
15. The method of deriving brake pedal travel according to claim 1, wherein the master cylinder pressure ranges from 0bar to 100 bar.
16. The method of deriving brake pedal travel of claim 15, wherein the range of brake pedal travel includes 0-100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810706132.4A CN110641428B (en) | 2018-06-27 | 2018-06-27 | Vehicle braking system and method for acquiring stroke of brake pedal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810706132.4A CN110641428B (en) | 2018-06-27 | 2018-06-27 | Vehicle braking system and method for acquiring stroke of brake pedal |
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| CN110641428A true CN110641428A (en) | 2020-01-03 |
| CN110641428B CN110641428B (en) | 2022-03-11 |
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| CN201810706132.4A Active CN110641428B (en) | 2018-06-27 | 2018-06-27 | Vehicle braking system and method for acquiring stroke of brake pedal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111619529A (en) * | 2020-06-05 | 2020-09-04 | 江铃汽车股份有限公司 | Brake opening obtaining method and system and vehicle |
| CN115257670A (en) * | 2022-08-30 | 2022-11-01 | 麦格纳动力总成(江西)有限公司 | Brake pressure control method and device for IPB brake system |
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| JP2008071305A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Pedal positioning apparatus |
| US20080265664A1 (en) * | 2007-04-26 | 2008-10-30 | Bryan Todd Fulmer | Method for estimating master cylinder pressure during brake apply |
| CN103661331A (en) * | 2012-09-04 | 2014-03-26 | 株式会社万都 | Control apparatus and method for brake |
| CN105620443A (en) * | 2016-03-10 | 2016-06-01 | 重庆长安汽车股份有限公司 | Brake pedal stroke calculation device and brake pedal stroke calculation method |
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2018
- 2018-06-27 CN CN201810706132.4A patent/CN110641428B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008071305A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Pedal positioning apparatus |
| US20080265664A1 (en) * | 2007-04-26 | 2008-10-30 | Bryan Todd Fulmer | Method for estimating master cylinder pressure during brake apply |
| CN103661331A (en) * | 2012-09-04 | 2014-03-26 | 株式会社万都 | Control apparatus and method for brake |
| CN105620443A (en) * | 2016-03-10 | 2016-06-01 | 重庆长安汽车股份有限公司 | Brake pedal stroke calculation device and brake pedal stroke calculation method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111619529A (en) * | 2020-06-05 | 2020-09-04 | 江铃汽车股份有限公司 | Brake opening obtaining method and system and vehicle |
| CN111619529B (en) * | 2020-06-05 | 2022-02-08 | 江铃汽车股份有限公司 | Brake opening obtaining method and system and vehicle |
| CN115257670A (en) * | 2022-08-30 | 2022-11-01 | 麦格纳动力总成(江西)有限公司 | Brake pressure control method and device for IPB brake system |
| CN115257670B (en) * | 2022-08-30 | 2023-08-11 | 麦格纳动力总成(江西)有限公司 | Brake pressure control method and device for IPB brake system |
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| CN110641428B (en) | 2022-03-11 |
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