CN113022526A - Exhausting and detecting method for hydraulic brake circuit of line control brake system - Google Patents
Exhausting and detecting method for hydraulic brake circuit of line control brake system Download PDFInfo
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- CN113022526A CN113022526A CN202110350925.9A CN202110350925A CN113022526A CN 113022526 A CN113022526 A CN 113022526A CN 202110350925 A CN202110350925 A CN 202110350925A CN 113022526 A CN113022526 A CN 113022526A
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- 239000012530 fluid Substances 0.000 claims abstract description 68
- 238000006073 displacement reaction Methods 0.000 claims abstract description 51
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- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 description 5
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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
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
- B60T17/222—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems by filling or bleeding of hydraulic systems
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Abstract
The invention discloses an exhaust and detection method of a hydraulic brake circuit of a line control brake system, which comprises the steps of sequentially pressurizing and guiding brake fluid of a brake master cylinder into a single brake pipeline where each brake caliper is located, and sequentially performing exhaust operation on the single brake pipeline; disconnecting the brake master cylinder from all the brake pipelines, carrying out exhaust detection on the brake master cylinder, judging whether the exhaust of the brake master cylinder is qualified, and if not, carrying out exhaust operation on each brake pipeline again until the exhaust of the brake master cylinder is qualified; and (3) sequentially introducing the brake fluid after the brake master cylinder is pressurized into a single brake pipeline, judging whether the piston displacement before and after the brake master cylinder is pressurized meets the exhaust standard, and if not, performing exhaust operation on the single brake pipeline until the piston displacement before and after the brake master cylinder connected with the brake pipeline is pressurized meets the exhaust standard. The detection method can automatically complete system exhaust detection, lock the position where exhaust is bad, increase exhaust steps in a targeted manner and avoid repeating the whole exhaust process.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to an exhaust and detection method for a hydraulic braking loop of a line control braking system.
Background
A hydraulic braking system of a vehicle pushes a caliper piston to act by relying on high-pressure brake fluid to implement braking, if air is mixed into a hydraulic braking pipeline, the pressure build of the pipeline is insufficient, and the braking risk is caused by insufficient braking force of the caliper. After the vehicle is charged with liquid and exhausted, the inspection of charging and exhausting can not be automatically realized through the vehicle, if the vehicle is exhausted badly, the customer pedal feeling complaint is easily caused, the workload is increased by repeated exhausting, and the vehicle braking safety accident can be caused in serious cases.
Disclosure of Invention
The invention aims to solve the defects of the background technology, and provides an exhaust and detection method of a hydraulic brake circuit of a brake-by-wire system, which can quickly lock a position with poor exhaust, exhaust the corresponding position in time and improve the efficiency of liquid adding and exhaust.
In order to achieve the purpose, the invention provides a method for exhausting and detecting a hydraulic brake circuit of a brake-by-wire system, which is characterized in that: the brake fluid of the brake master cylinder is sequentially pressurized and led into a single brake pipeline where each brake caliper is located, and the single brake pipeline is sequentially subjected to exhaust operation; disconnecting the brake master cylinder from all the brake pipelines, carrying out exhaust detection on the brake master cylinder, judging whether the exhaust of the brake master cylinder is qualified, and if not, carrying out exhaust operation on each brake pipeline again until the exhaust of the brake master cylinder is qualified; and (3) sequentially introducing the brake fluid after the brake master cylinder is pressurized into a single brake pipeline, judging whether the piston displacement before and after the brake master cylinder is pressurized meets the exhaust standard, and if not, performing exhaust operation on the single brake pipeline until the piston displacement before and after the brake master cylinder connected with the brake pipeline is pressurized meets the exhaust standard.
Preferably, a plunger type brake master cylinder with a first piston, a second piston, a front cavity and a rear cavity is adopted, the first piston is connected with an electric power-assisted driving mechanism consisting of a master cylinder motor and a speed reducer, and a brake pipeline where each brake caliper is located is connected with the front cavity or the rear cavity of the brake master cylinder.
Further, the method for sequentially pressurizing and guiding the brake fluid of the brake master cylinder into the single brake pipeline where each brake caliper is located comprises the following steps: the electric boosting driving mechanism pushes the first piston to move to boost the brake fluid, the brake master cylinder is communicated with each brake pipeline through the pressure limiting valve, the opening and closing of the pressure limiting valve are controlled, the brake master cylinder is communicated or not communicated with a single brake pipeline, the opening and closing of the boosting valve on each brake pipeline are controlled, and the brake fluid of the single brake pipeline is boosted.
Preferably, the two brake pipelines share one pressure limiting valve, and the two brake pipelines are connected with a front cavity or a rear cavity of the brake master cylinder through the pressure limiting valve.
Preferably, the brake fluid of the brake master cylinder is pressurized and guided into the single brake pipe where each brake caliper is located in a diagonally arranged, proximal-to-distal exhaust sequence.
Further, the method for exhausting the single brake pipe comprises the following steps: and the electric power-assisted driving mechanism pushes the first piston to move so as to pressurize the brake fluid, when the displacement of the first piston reaches a target set value or the brake fluid pressure of the brake master cylinder reaches a target hydraulic pressure value, the position of the first piston is kept, the exhaust nut of the brake pipeline is loosened, the exhaust nut is screwed after the high-pressure brake fluid flows out, the electric power-assisted driving mechanism releases the first piston, the first piston returns to the initial position, and the steps are repeated for at least three times.
Further, the method for detecting exhaust of the brake master cylinder and judging whether the exhaust of the brake master cylinder is qualified or not includes: the method comprises the steps of pushing a piston of a brake master cylinder to move to pressurize brake fluid, recording the displacement S1 of a first piston when the brake fluid pressure of the brake master cylinder reaches the pressure value when a brake caliper is attached to a brake disc, recording the displacement S2 of the first piston when the brake fluid pressure of the brake master cylinder reaches the set value of the clamping force of the brake caliper and the brake disc, and judging whether the difference value of S1 and S2 meets a target displacement value.
Preferably, the brake fluid of the brake master cylinder is sequentially pressurized and guided into a single brake pipeline where each brake caliper is located in a diagonally arranged and near-to-far exhaust detection sequence, and whether the single brake pipeline meets the exhaust standard or not is judged.
Further, the method for judging whether the piston displacement before and after the pressurization of the brake master cylinder meets the exhaust standard comprises the following steps: the electric power-assisted driving mechanism pushes the first piston to move so as to pressurize brake fluid, when the brake fluid pressure of the brake master cylinder reaches the pressure value when the brake caliper is attached to the brake disc, the displacement S1 of the first piston is recorded, when the brake fluid pressure of the brake master cylinder reaches the set value of the clamping force of the brake caliper and the brake disc, the displacement S1 of the first piston is recorded, and whether the difference value between S1 and S2 meets the target displacement value or not is judged.
Furthermore, the rear cavity of the brake master cylinder is connected with a pressure sensor, the pressure value of the pressure sensor is read, and whether the brake fluid pressure of the brake master cylinder reaches the pressure value when the brake caliper is attached to the brake disc or whether the brake fluid pressure reaches the set value of the clamping force of the brake caliper and the brake disc is judged.
The invention has the beneficial effects that: the brake master cylinder is driven by the electric power-assisted driving mechanism and is combined with the ESC, only a single person is needed to cooperate with a system program to exhaust, and the exhaust operation is simplified. Through the action of the ESC valve system, the brake master cylinder only pressurizes a single-wheel hydraulic pipeline, so that the pressure building capacity of the hydraulic pipeline can be improved, and the exhaust efficiency is obviously improved. The detection method designed by the invention can automatically complete the detection of system exhaust, lock the position of bad exhaust, increase the exhaust step pertinently, avoid repeating the whole exhaust process, shorten the operation time, and meanwhile, the invention is a software control strategy developed by the hardware based on the brake-by-wire, does not need to add new hardware, and saves the cost.
Drawings
FIG. 1 is a schematic piping connection diagram of a hydraulic brake circuit of a brake-by-wire system according to the present invention;
FIG. 2 is a flow chart of a method of venting and detecting a hydraulic brake circuit of the brake-by-wire system of the present invention;
wherein, 1-a master cylinder motor, 2-a retarder, 3-a brake master cylinder (3.1-a first piston, 3.2-a second piston, 3.3-a front cavity, 3.4-a rear cavity), 4-a pressure sensor, 5-a first pressure limiting valve, 6-a second pressure limiting valve, 7-a first booster valve, 8-a second booster valve, 9-a third booster valve, 10-a fourth booster valve, 11-a first brake pipe, 12-a second brake pipe, 13-a third brake pipe, 14-a fourth brake pipe, 15-a right front wheel, 16-a left rear wheel, 17-a left front wheel, 18-a right rear wheel, 19-an ESC module, 20-a first suction valve, 21-a second suction valve, 22-a first hydraulic pump, 23-a second hydraulic pump, 24-a vehicle driving motor, 25-a first check valve, 26-a second check valve, 27-a first pressure reducing valve, 28-a second pressure reducing valve, 29-a third pressure reducing valve, 30-a fourth pressure reducing valve, 31-the first accumulator, 32-the second accumulator.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1-2, the method for exhausting and detecting the hydraulic brake circuit of the brake-by-wire system comprises the following steps: when the vehicle starts charging and exhausting, the left front wheel pipeline (the third brake pipeline 13) is firstly pressurized and exhausted.
The ESC controller controls the first pressure limiting valve 5 to be closed, the second pressure limiting valve 6 to be opened, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be opened and the fourth pressure increasing valve 10 to be closed. Brake fluid cannot enter the first brake pipe 11, the second brake pipe 12 and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes the first piston 3.1 of the brake master cylinder 3 to move forwards, brake fluid is discharged from a liquid outlet of the rear cavity 3.4 and enters the third brake pipeline 13, and the hydraulic pressure in the pipelines is efficiently increased. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards continuously to pressurize the brake fluid, when the displacement of the first piston 3.1 reaches a target set value or when the hydraulic pressure of the brake master cylinder 3 reaches a target hydraulic pressure (obtained by actual measurement of a well-exhausted vehicle according to the same exhaust test method, the same below), the position of the first piston 3.1 is kept, a signal is sent to an exhaust operator, the exhaust nut of the left front wheel is loosened, and the exhaust nut is tightened after the high-pressure brake fluid flows out. The electric power-assisted driving mechanism releases the first piston 3.1, and the first piston 3.1 returns to the initial position. And (4) keeping the position of the ESC valve system, and repeating the steps to exhaust the pipeline three times to finish the exhaust of the pipeline of the left front wheel.
The right rear wheel pipe (fourth brake pipe 14) is pressurized and exhausted. The ESC controller controls the first pressure limiting valve 5 to be closed, the second pressure limiting valve 6 to be opened, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be opened. The boosted brake fluid cannot enter the first brake pipe 11, the second brake pipe 12, and the third brake pipe 13. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, brake fluid is discharged from a liquid outlet of the rear cavity 3.4 and enters the fourth brake pipeline 14, and the hydraulic pressure in the pipelines is efficiently increased. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards continuously to pressurize the brake fluid, when the displacement of the first piston 3.1 reaches a target set value or the hydraulic pressure of the brake master cylinder 3 reaches a target hydraulic pressure, the position of the first piston 3.1 is kept, a signal is sent to an exhaust operator, an exhaust nut of the right rear wheel is loosened, and the exhaust nut is screwed down after the high-pressure brake fluid flows out. The electric power-assisted driving mechanism releases the first piston 3.1, and the first piston 3.1 returns to the initial position. And keeping the ESC valve system at the position, and repeating the exhaust operation to complete the exhaust to the right rear wheel pipeline.
The right front wheel line (first brake line 11) is pressurized and exhausted. The ESC controller controls the first pressure limiting valve 5 to be opened, the second pressure limiting valve 6 to be closed, the first pressure increasing valve 7 to be opened, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be closed. The boosted brake fluid cannot enter the second brake pipe 12, the third brake pipe 13, and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, brake fluid is discharged from a fluid outlet of the front cavity 3.3 and enters the first brake pipeline 11, and the hydraulic pressure in the pipeline is efficiently increased. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards continuously to pressurize the brake fluid, when the displacement of the first piston 3.1 reaches a target set value or the hydraulic pressure of the brake master cylinder 3 reaches a target hydraulic pressure, the position of the first piston 3.1 is kept, a signal is sent to an exhaust operator, the exhaust nut of the front right wheel is loosened, and the exhaust nut is screwed after the high-pressure brake fluid flows out. The electric power-assisted driving mechanism releases the first piston 3.1, and the first piston 3.1 returns to the initial position. And keeping the ESC valve system at the position, and repeating the exhaust operation to finish the exhaust to the right front wheel pipeline.
The left rear wheel line (second brake line 12) is pressurized and exhausted. The ESC controller controls the first pressure limiting valve 5 to be opened, the second pressure limiting valve 6 to be closed, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be opened, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be closed. The boosted brake fluid cannot enter the first brake pipe 11, the third brake pipe 13, and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes and pushes the first piston 3.1 to move forwards, brake fluid is discharged from a fluid outlet of the front cavity 3.3 and enters the second brake pipeline 12, and the hydraulic pressure in the pipelines is efficiently increased. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards continuously to pressurize the brake fluid, when the displacement of the first piston 3.1 reaches a target set value or the hydraulic pressure of the brake master cylinder 3 reaches a target hydraulic pressure, the position of the first piston 3.1 is kept, a signal is sent to an exhaust operator, the exhaust nut of the left rear wheel is loosened, and the exhaust nut is screwed after the high-pressure brake fluid flows out. The electric power-assisted driving mechanism releases the first piston 3.1, and the first piston 3.1 returns to the initial position. And keeping the ESC valve system at the position, and repeating the exhaust operation to finish the exhaust to the left rear wheel pipeline.
At this point, the exhaust operation to the four-wheel pipeline is completed, and the detection program is started to detect the exhaust of the brake system. First, exhaust of the brake master cylinder 3 and the brake lines from the master cylinder to the first pressure increasing valve 7 to the fourth pressure increasing valve 10 are detected. The ESC controller controls the first pressure limiting valve 5 to close, the second pressure limiting valve 6 to close, the first pressure increasing valve 7 to close, the second pressure increasing valve 8 to close, the third pressure increasing valve 9 to close, and the fourth pressure increasing valve 10 to close. The boosted brake fluid cannot enter the first, second, third and fourth brake lines 11, 12, 13, 14. The electric boosting driving mechanism pushes the first piston 3.1 to move forwards, and liquid in brake pipelines from the brake master cylinder 3 to the first pressure increasing valve 7, the second pressure increasing valve 8, the third pressure increasing valve 9 and the fourth pressure increasing valve 10 is pressurized. When the pressure sensor 4 detects that the pressure reaches 0.1MPa, the displacement of the first piston 3.1 is recorded. And (5) continuing to push the first piston 3.1 until the hydraulic pressure of the rear cavity reaches a target value, and recording the displacement of the first piston 3.1 at the moment. And calculating the displacement difference value of the first piston 3.1 under the target hydraulic pressure and the 0.1MPa hydraulic pressure, comparing the displacement difference value with a target displacement value set in the system, and judging whether the brake main cylinder 3 and the brake pipelines from the brake main cylinder 3 to the booster valves are well exhausted. If the brake main cylinder 3 and the brake pipeline from the brake main cylinder 3 to a certain pressure increasing valve have poor air exhaust, the air exhaust process of the four-wheel pipeline is repeated until the pipeline from the brake main cylinder 3 to the pressure increasing valve has good air exhaust. If the brake lines from the master cylinder 3 and the master cylinder 3 to the respective booster valves are exhausted well, the exhaust detection of the first to fourth brake lines is started.
The exhaust detection is first performed on the third pressure increasing valve 9 to left front wheel 17 line. The ESC controller controls the first pressure limiting valve 5 to be closed, the second pressure limiting valve 6 to be opened, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be opened and the fourth pressure increasing valve 10 to be closed. The boosted brake fluid cannot enter the first brake pipe 11, the second brake pipe 12, and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, brake fluid is discharged from a fluid outlet of the rear cavity 3.4 and enters the third brake pipeline 13, and the hydraulic pressure in the pipelines is increased. When the pressure sensor 4 detects that the pressure reaches 0.1MPa, the left front wheel friction plate is well attached to the brake disc, and the displacement of the first piston 3.1 is recorded. And continuously pushing the first piston 3.1 until the hydraulic pressure of the rear cavity 3.4 reaches a target value, recording the displacement of the first piston 3.1 at the moment, and releasing the first piston 3.1 by the electronic power-assisted driving mechanism to return to the initial position. And calculating the displacement difference value of the first piston 3.1 under the target hydraulic pressure and the hydraulic pressure of 0.1MPa, comparing the displacement difference value with a target displacement value set in the system, and judging whether the pipeline from the third pressure increasing valve 9 to the left front wheel 17 exhausts well or not.
If the pipeline from the third booster valve 9 to the left front wheel 17 has poor air exhaust, the air exhaust process of the left front wheel 17 is repeated, and after the air exhaust is finished, whether the pipeline from the third booster valve 9 to the left front wheel 17 exhausts air well is detected again until the detection is qualified.
If the exhaust of the pipelines from the third booster valve 9 to the left front wheel 17 is good, the exhaust detection is carried out on the pipelines from the fourth booster valve 10 to the right rear wheel 18. The ESC controller controls the first pressure limiting valve 5 to be closed, the second pressure limiting valve 6 to be opened, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be opened. Brake fluid cannot enter the first brake pipe 11, the second brake pipe 12, and the third brake pipe 13. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, brake fluid is discharged from a fluid outlet of the rear cavity 3.4 and enters the fourth brake pipeline 14, and the hydraulic pressure in the pipelines is increased. When the pressure sensor 4 detects that the pressure reaches 0.1MPa, the right rear wheel friction plate is well attached to the brake disc, and the displacement of the first piston 3.1 is recorded. And continuously pushing the first piston 3.1 until the hydraulic pressure of the rear cavity 3.4 reaches a target value, recording the displacement of the first piston 3.1 at the moment, and releasing the first piston 3.1 by the electronic power-assisted driving mechanism to return to the initial position. And calculating the displacement difference value of the first piston 3.1 under the target hydraulic pressure and the hydraulic pressure of 0.1MPa, comparing the displacement difference value with a target displacement value set in the system, and judging whether the pipelines from the third booster valve 9 to the right rear wheel 18 exhaust well or not.
If the pipelines from the fourth booster valve 10 to the right rear wheel 18 have poor air exhaust, the air exhaust process of the right rear wheel 18 is repeated, and after the air exhaust is finished, whether the pipelines from the fourth booster valve 10 to the right rear wheel 18 exhaust well or not is detected again until the detection is qualified.
If the fourth pressure increasing valve 10 to the right rear wheel 18 pipe is exhausted well, the exhaust detection is performed on the first pressure increasing valve 7 to the right front wheel 15 pipe. The ESC controller controls the first pressure limiting valve 5 to be opened, the second pressure limiting valve 6 to be closed, the first pressure increasing valve 7 to be opened, the second pressure increasing valve 8 to be closed, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be closed. Brake fluid cannot enter the second brake pipe 12, the third brake pipe 13, and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, brake fluid is discharged from a fluid outlet of the front cavity 3.3 and enters the first brake pipeline 11, and the hydraulic pressure in the pipeline is increased. When the pressure sensor 4 detects that the pressure reaches 0.1MPa, the right front wheel friction plate is well attached to the brake disc, and the displacement of the first piston 3.1 is recorded. And continuously pushing the first piston 3.1 until the hydraulic pressure of the front cavity 3.3 reaches a target value, recording the displacement of the first piston 3.1 at the moment, and releasing the first piston 3.1 by the electronic power-assisted driving mechanism to return to the initial position. And calculating the displacement difference value of the first piston 3.1 under the target hydraulic pressure and the hydraulic pressure of 0.1MPa, comparing the displacement difference value with a target displacement value set in the system, and judging whether the pipeline from the first pressure increasing valve 7 to the right front wheel 15 exhausts well or not.
If the pipeline from the first pressure increasing valve 7 to the right front wheel 15 has poor air exhaust, the air exhaust process of the right front wheel 15 is repeated, and after the air exhaust is finished, whether the pipeline from the first pressure increasing valve 7 to the right front wheel 15 exhausts air well is detected again until the detection is qualified.
If the first pressure increasing valve 7 to the right front wheel 15 line exhausts well, the second pressure increasing valve 8 to the left rear wheel 16 line is subjected to exhaust detection. The ESC controller controls the first pressure limiting valve 5 to be opened, the second pressure limiting valve 6 to be closed, the first pressure increasing valve 7 to be closed, the second pressure increasing valve 8 to be opened, the third pressure increasing valve 9 to be closed and the fourth pressure increasing valve 10 to be closed. The boosted brake fluid cannot enter the first brake pipe 11, the third brake pipe 13, and the fourth brake pipe 14. The electric power-assisted driving mechanism pushes the first piston 3.1 to move forwards, and brake fluid is discharged from a fluid outlet of the front cavity 3.3 and enters the second brake pipeline 12 to increase the hydraulic pressure in the pipeline. When the pressure sensor 4 detects that the pressure reaches 0.1MPa, the left rear wheel friction plate is well attached to the brake disc, and the displacement of the first piston 3.1 is recorded. And continuously pushing the first piston 3.1 until the hydraulic pressure of the front cavity 3.3 reaches a target value, recording the displacement of the first piston 3.1 at the moment, and releasing the first piston 3.1 by the electronic power-assisted driving mechanism to return to the initial position. And calculating the displacement difference value of the first piston 3.1 under the target hydraulic pressure and the hydraulic pressure of 0.1MPa, comparing the displacement difference value with a target displacement value set in the system, and judging whether the pipeline from the second pressure increasing valve 8 to the left rear wheel 16 exhausts well or not.
If the pipelines from the second pressure increasing valve 8 to the left rear wheel 16 have poor air exhaust, the air exhaust process of the left rear wheel 16 is repeated, and after the air exhaust is finished, whether the pipelines from the second pressure increasing valve 8 to the left rear wheel 16 exhaust well or not is detected again until the detection is qualified. After the brake pipelines from the brake main cylinder 3 to the booster valves and from the booster valves to the brake pipelines of the four wheels are exhausted and detected well, the exhaust detection program is finished, and the whole exhaust and detection process is completed.
After the detection of the third pipeline 13 is completed, the ESC controller controls the valve train to keep the current position, and meanwhile, the fourth boost valve 10 is opened, and the electric power-assisted driving mechanism pushes the first piston 3.1 to detect the boost of the fourth brake pipeline. On the basis, the second pressure limiting valve 6, the third pressure increasing valve 9 and the fourth pressure increasing valve 10 are closed, the first pressure limiting valve 5 and the first pressure increasing valve 7 are opened, and then the first piston 3.1 is continuously pushed to detect the first brake pipeline 11. Then, the ESC controller controls the valve system to keep the current position, meanwhile, the second boosting valve 8 is opened, and the electric boosting driving mechanism pushes the first piston 3.1 to boost the pressure of the second brake pipeline 12 for detection. The detection of four-wheel pipelines is completed at one time, and when the loop is complete in exhaust, the detection efficiency can be improved.
In the detection process, whether the stroke difference value of the first piston 3.1 exceeds a preset value or not can be judged according to the condition that the current and the torque of the main cylinder motor 1 reach preset values, so that whether the exhaust is qualified or not is judged.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A method for exhausting and detecting a hydraulic brake circuit of a line control brake system is characterized in that: the brake fluid of the brake master cylinder (3) is sequentially pressurized and led into a single brake pipeline where each brake caliper is located, and the single brake pipeline is sequentially exhausted; disconnecting the brake master cylinder (3) from all the brake pipelines, carrying out exhaust detection on the brake master cylinder (3), judging whether the exhaust of the brake master cylinder (3) is qualified, and if not, carrying out exhaust operation on each brake pipeline again until the exhaust of the brake master cylinder (3) is qualified; and the brake fluid after the pressurization of the brake master cylinder (3) is sequentially led into a single brake pipeline, whether the piston displacement before and after the pressurization of the brake master cylinder (3) meets the exhaust standard or not is judged, if not, the single brake pipeline is subjected to exhaust operation until the piston displacement before and after the pressurization of the brake master cylinder (3) connected with the brake pipeline meets the exhaust standard.
2. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 1, characterized in that: a plunger type brake master cylinder with a first piston (3.1), a second piston (3.2), a front cavity (3.3) and a rear cavity (3.4) is adopted, the first piston (3.1) is connected with an electric power-assisted driving mechanism consisting of a master cylinder motor (1) and a speed reducer (2), and a brake pipeline where each brake caliper is located is connected with the front cavity (3.3) or the rear cavity (3.4) of the brake master cylinder (3).
3. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 2, characterized in that: the method for sequentially pressurizing and guiding the brake fluid of the brake master cylinder (3) into a single brake pipeline where each brake caliper is located comprises the following steps: the electric power-assisted driving mechanism pushes the first piston (3.1) to move to pressurize the brake fluid, the brake master cylinder (3) is communicated with each brake pipeline through the pressure limiting valve, the opening and closing of the pressure limiting valve are controlled, the brake master cylinder (3) is communicated or not communicated with a single brake pipeline, the opening and closing of the booster valve on each brake pipeline are controlled, and the brake fluid of the single brake pipeline is pressurized.
4. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 3, characterized in that: the two brake pipelines share one pressure limiting valve, and are connected with a front cavity (3.3) or a rear cavity (3.4) of the brake master cylinder (3) through one pressure limiting valve.
5. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 4, wherein: the brake fluid of the brake master cylinder (3) is sequentially pressurized and guided into a single brake pipeline where each brake caliper is located in a diagonally arranged and near-far exhaust sequence.
6. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 5, characterized in that: the method for exhausting the single brake pipe comprises the following steps: the electric power-assisted driving mechanism pushes the first piston (3.1) to move so as to pressurize the brake fluid, when the displacement of the first piston (3.1) reaches a target set value or when the brake fluid pressure of the brake master cylinder (3) reaches a target hydraulic pressure value, the position of the first piston (3.1) is kept, an exhaust nut of the brake pipeline is loosened, the exhaust nut is screwed after the high-pressure brake fluid flows out, the electric power-assisted driving mechanism releases the first piston (3.1), the first piston (3.1) returns to an initial position, and the steps are repeated for at least three times.
7. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 1, characterized in that: the method for detecting the exhaust of the brake master cylinder (3) and judging whether the exhaust of the brake master cylinder (3) is qualified is as follows: the method comprises the steps of pushing a piston of a brake master cylinder (3) to move to pressurize brake fluid, recording the displacement S1 of a first piston (3.1) when the brake fluid pressure of the brake master cylinder (3) reaches the pressure value when a brake caliper is attached to a brake disc, recording the displacement S2 of the first piston (3.1) when the brake fluid pressure of the brake master cylinder (3) reaches the set value of the clamping force of the brake caliper and the brake disc, and judging whether the difference value between S2 and S1 meets the target displacement value.
8. The exhausting and detecting method of a hydraulic brake circuit of a brake-by-wire system according to claim 2, characterized in that: and the brake fluid of the brake master cylinder (3) is sequentially pressurized and guided into a single brake pipeline where each brake caliper is located in a diagonally arranged and near-to-far exhaust detection sequence, and whether the single brake pipeline meets the exhaust standard or not is judged.
9. The exhausting and detecting method of the hydraulic brake circuit of the brake-by-wire system according to claim 8, wherein: the method for judging whether the piston displacement before and after the pressurization of the brake master cylinder (3) meets the exhaust standard or not comprises the following steps: the electric power-assisted driving mechanism pushes the first piston (3.1) to move so as to pressurize brake fluid, when the brake fluid pressure of the brake master cylinder (3) reaches the pressure value when the brake caliper is attached to the brake disc, the displacement S1 of the first piston (3.1) is recorded, when the brake fluid pressure of the brake master cylinder (3) reaches the set value of the clamping force of the brake caliper and the brake disc, the displacement S2 of the first piston (3.1) is recorded, and whether the difference value between S2 and S1 meets the target displacement value or not is judged.
10. The exhausting and detecting method of the hydraulic brake circuit of the brake-by-wire system according to claim 7 or 9, wherein: the rear cavity (3.4) of the brake master cylinder (3) is connected with a pressure sensor (4), the pressure value of the pressure sensor (4) is read, and whether the brake hydraulic pressure of the brake master cylinder (3) reaches the pressure value when the brake caliper is attached to the brake disc or the set value of the clamping force of the brake caliper and the brake disc is judged.
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