CN110696804B - Leakage detection method and device for brake system - Google Patents
Leakage detection method and device for brake system Download PDFInfo
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- CN110696804B CN110696804B CN201911112584.0A CN201911112584A CN110696804B CN 110696804 B CN110696804 B CN 110696804B CN 201911112584 A CN201911112584 A CN 201911112584A CN 110696804 B CN110696804 B CN 110696804B
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- brake cylinder
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- leakage
- brake
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Abstract
The invention provides a method and a device for detecting leakage of a brake system, wherein the method comprises the following steps: firstly, receiving a leakage test instruction; then, judging whether the brake system is in a stop state or not; when the brake system is judged to be in a stop state, pressure adjustment is carried out on a brake cylinder; if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the energy accumulator and the brake cylinder have leakage faults or not; and if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault. Therefore, the method for automatically and intelligently detecting the leakage of the brake system is realized.
Description
Technical Field
The invention relates to the technical field of urban rail train control, in particular to a leakage detection method and device of a braking system.
Background
The brake system is used as a key subsystem in a train system, and whether the performance of the brake system is stable and reliable directly determines the overall safety performance of the train.
At present, when a brake system is subjected to leakage inspection, two steps of separately detecting the leakage conditions of an accumulator pipeline and a brake pipeline are needed, and a manual pump needs to be manually shaken for hundreds of times to reach a specified test pressure. It is time-consuming and labor-consuming. And after the pressure is stable, recording the pressure of the brake pipeline, standing for a period of time, recording the brake management pressure, calculating whether the pressure drop value of the brake pipeline is within a standard requirement range, and if not, indicating that the leakage of the brake pipeline exceeds the standard.
Therefore, a method for automatically and intelligently detecting the leakage of the brake system is needed.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for detecting a leakage of a brake system, so as to implement an automatic and intelligent method for detecting a leakage of a brake system.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a method of leak detection for a brake system, comprising:
receiving a leakage test instruction;
judging whether the brake system is in a stop state or not;
if the brake system is judged to be in a stop state, pressure adjustment is carried out on the brake cylinder;
if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the energy accumulator and the brake cylinder have leakage faults or not;
and if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault.
Optionally, the determining whether the braking system is in a stopped state includes:
judging whether the current speed of the engine is zero or not;
if the speed of the current engine is judged to be zero, judging whether the current traction force is zero or not;
and if the current traction force is judged to be zero, the brake system is in a stop state.
Optionally, the pressure adjustment of the brake cylinder includes:
in a first preset time, disconnecting the interruption solenoid valve and the pressure maintaining solenoid valve, and controlling the proportional solenoid valve according to a preset requirement;
enabling the pressure maintaining electromagnetic valve within a second preset time, and controlling the proportional electromagnetic valve according to half of the preset requirement; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder;
within a third preset time, the proportional solenoid valve is powered off, and the pressure maintaining solenoid valve is enabled; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder;
enabling the interruption solenoid valve and the pressure maintaining solenoid valve simultaneously within a fourth preset time;
the first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence.
Optionally, the determining whether the accumulator and the brake cylinder have the leakage fault includes:
recording the pressure value of the energy accumulator at preset time intervals;
calculating the pressure difference of the energy accumulators in adjacent time;
if the pressure difference of the energy accumulator is greater than the pressure difference threshold value of the energy accumulator, indicating that the energy accumulator has a leakage fault in a corresponding time period;
the judging of whether the brake cylinder has the leakage fault in the judging of whether the accumulator and the brake cylinder have the leakage fault includes:
recording the pressure value of the brake cylinder at preset time intervals;
calculating the pressure difference of the brake cylinders in adjacent time;
if the pressure difference of the brake cylinder is larger than the pressure difference threshold value of the brake cylinder, the brake cylinder is indicated to have a leakage fault in a corresponding time period.
Optionally, if it is determined that any one of the accumulator and the brake cylinder has a leakage fault, after it is determined that the brake system has the leakage fault, the method further includes: and reporting the leakage fault to a server.
A leak detection device of a brake system, comprising:
a receiving unit for receiving a leak test instruction;
the first judgment unit is used for judging whether the brake system is in a stop state or not;
the pressure adjusting unit is used for adjusting the pressure of the brake cylinder if the brake system is in a stop state judged by the first judging unit;
the second judgment unit is used for judging whether the energy accumulator and the brake cylinder have leakage faults or not if the pressure value of the brake cylinder meets the leakage test requirement;
and the confirming unit is used for indicating that the brake system has a leakage fault if any one of the accumulator and the brake cylinder has the leakage fault according to the judgment of the second judging unit.
Optionally, the first determining unit includes:
an engine speed judgment unit for judging whether the current engine speed is zero;
the traction judging unit is used for judging whether the current traction is zero or not if the engine speed judging unit judges that the current engine speed is zero;
if the traction judging unit judges that the current traction is zero, the braking system is in a stop state.
Optionally, the pressure adjusting unit includes:
the first control unit is used for disconnecting the interruption solenoid valve and the pressure maintaining solenoid valve within first preset time and controlling the proportional solenoid valve according to preset requirements;
the first adjusting unit is used for enabling the pressure maintaining electromagnetic valve within a second preset time and controlling the proportional electromagnetic valve according to half of the preset requirement; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder;
the second adjusting unit is used for enabling the proportional solenoid valve to be powered off and the pressure maintaining solenoid valve to be enabled within a third preset time; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder;
the second control unit is used for enabling the interruption solenoid valve and the pressure maintaining solenoid valve simultaneously within a fourth preset time;
the first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence.
Optionally, the second determining unit includes:
the brake system comprises an energy accumulator judging unit and a brake cylinder judging unit;
the accumulator determination unit includes:
the first recording unit is used for recording the pressure value of the energy accumulator at intervals of preset time;
a first calculation unit for calculating a pressure difference of the accumulators at adjacent times;
the first fault confirming unit is used for indicating that the accumulator has a leakage fault in a corresponding time period if the pressure difference of the accumulator is greater than the pressure difference threshold value of the accumulator;
the brake cylinder determination unit includes:
the second recording unit is used for recording the pressure value of the brake cylinder at intervals of preset time;
the second calculation unit is used for calculating the pressure difference of the brake cylinders in adjacent time;
and the second fault confirming unit is used for indicating that the brake cylinder has a leakage fault in a corresponding time period if the pressure difference of the brake cylinder is greater than the pressure difference threshold value of the brake cylinder.
Optionally, the leakage detecting apparatus of the braking system further includes:
and the reporting unit is used for reporting the leakage fault to a server.
According to the scheme, in the method and the device for detecting the leakage of the braking system, firstly, a leakage test instruction is received; then, judging whether the brake system is in a stop state or not; when the brake system is judged to be in a stop state, pressure adjustment is carried out on a brake cylinder; if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the energy accumulator and the brake cylinder have leakage faults or not; and if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault. Therefore, the method for automatically and intelligently detecting the leakage of the brake system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic illustration of a prior art hydraulic brake system;
FIG. 2 is a flowchart illustrating a method for detecting a leak in a brake system according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for detecting a leak in a brake system according to another embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for detecting a leak in a brake system according to another embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for detecting a leak in a brake system according to another embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for detecting a leak in a brake system according to another embodiment of the present invention;
fig. 7 is a schematic view of a leak detection apparatus of a brake system according to another embodiment of the present invention;
fig. 8 is a schematic diagram of a first determining unit in a leak detecting device of a braking system according to another embodiment of the present invention;
fig. 9 is a schematic view of a pressure adjustment unit in a leak detection apparatus of a brake system according to another embodiment of the present invention;
fig. 10 is a schematic diagram of a second determination unit in a leak detection apparatus of a braking system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The brake system related to the present invention may be a hydraulic brake system in the prior art, wherein a schematic diagram of the hydraulic brake system may be as shown in fig. 1, and 01 in fig. 1 represents a motor; 02 represents an oil pump; 03 represents a relief valve; 04 and 17 represent filters; 05 represents a check valve; 06 and 15 represent pressure switches; 07 and 18 represent pressure detecting ports; 09 represents a two-position two-way valve; 10 represents the shutoff solenoid valve; 12 represents a pressure maintaining solenoid valve; 13 represents a proportional pressure reducing valve; 14 denotes an emergency solenoid valve; b02 represents an accumulator; b03 represents a hydraulic hose; b05 and B07 represent quick-connect connectors.
At present, a hydraulic brake system mainly drives an oil pump 02 to fill oil into an energy accumulator B02 through a motor 01, so that stable oil pressure is provided for the hydraulic brake system and the oil pressure is used as a braking energy source of the hydraulic brake system. During braking, the oil passes through the shutoff solenoid valve 10, the proportional pressure reducing valve 13 and the emergency solenoid valve 14 and is finally output to the brake cylinder. If the oil leaks, the environment is polluted, and the oil pressure cannot be generated, so that the braking pressure source is lost, and the leakage problem of the hydraulic braking system needs to be timely, conveniently and effectively detected.
In the prior art, when a hydraulic system is checked, two steps are required to be separated: the leakage of the accumulator line and the brake line is detected while the detection of the hydraulic unit components is not possible. When detecting the brake pipe way and leaking, need pull out quick connector B05, terminate the oil pressure gauge at the braking clamp, external manual pump in quick connector B05 department, pump oil to the brake pipe way through hand mode, need shake several hundred times manual pump and just can reach the test pressure of regulation, it is very hard to waste time. And after the pressure is stable, recording the pressure of the brake pipeline, standing for a period of time, recording the brake management pressure, calculating whether the pressure drop value of the brake pipeline is within a standard requirement range, and if not, indicating that the leakage of the brake pipeline exceeds the standard.
When the energy accumulator pipeline leakage test is carried out, the quick connector B07 needs to be pulled out, the manual pump is connected with the energy accumulator through the B07, and the energy accumulator cannot be externally connected with a test meter because the energy accumulator does not have a redundant test port. The manual oil pump can only pump oil to the energy accumulator, and when the manual oil pump is kept still for a long time, whether leakage exists or not is detected by checking whether oil stains exist in the pipeline of the energy accumulator, and the detection accuracy is difficult to quantify.
And after the leakage inspection is finished, the pressure of a manual pump needs to be released, the corresponding quick-connection plug is pulled out and connected to the hydraulic unit again, the process is complicated, the leakage detection is not in place, the daily inspection can be carried out only by a rough method for checking whether oil stains exist in all pipelines at the bottom of the vehicle, and the problems of inaccurate detection result, high operation difficulty, untimely detection and the like exist.
Therefore, an embodiment of the present invention provides a method for detecting a brake system leakage, which is used for automatically and intelligently detecting a brake system leakage, and as shown in fig. 2, the method mainly includes the following steps:
s201, receiving a leakage test instruction.
It should be noted that the leakage test instruction can be triggered by the user through the man-machine interface of the microcomputer display screen at any time; the leakage instruction sent by the user through the APP and the like can be sent to a cloud server, and then the cloud server sends the leakage instruction to a device for realizing the leakage detection method of the brake system, so that remote control is realized.
S202, judging whether the brake system is in a stop state or not.
It should be noted that, in order to avoid affecting the accuracy of the leakage test, the motor needs to be turned off during the leakage test; therefore, in the step, after the leakage test instruction is received, a stop instruction is issued to the brake system; and continuously judges whether the brake system is in a stopped state.
Specifically, if it is determined that the brake system is in the stopped state, step S203 is executed; if the brake system is judged not to be in the stagnation state, whether the brake system is in the stop state or not is continuously judged until the brake system is in the static state, if the brake system cannot be in the static state after a certain time, the brake system is possibly in a fault state, and the fault is reported to the server immediately.
Optionally, in another embodiment of the present invention, as shown in fig. 3, an implementation manner of step S202 includes:
s301, judging whether the speed of the current engine is zero or not.
Specifically, if it is determined that the current engine speed is zero, step S302 is executed.
In this step, whether the current engine speed is zero can be determined by any conventional method in the prior art, which is not limited herein.
And S302, judging whether the current traction force is zero or not.
Specifically, if the current traction force is determined to be zero, the determination result of step S303 is obtained.
In this step, whether the current tractive force is zero can be determined by any conventional method in the prior art, which is not limited herein.
And S303, the braking system is in a stop state.
S203, pressure adjustment is carried out on the brake cylinder.
Note that, since the motor is already turned off in step S202, but the system still needs to output the braking target value required in the test process, in this step, the braking target value required in the test process can be generated by controlling the duty ratios of the proportional pressure reducing valve, the shutoff solenoid valve, and the pressure maintaining solenoid valve and the logic sequence of the power on/off of each solenoid valve.
Meanwhile, the condition that the service life of the proportional pressure reducing valve is influenced because the proportional pressure reducing valve is always electrified to be adjusted when the brake is in a long-time brake state can be avoided, the pressure of the energy accumulator is always in a loss state because the proportional pressure reducing valve is electrified, and the service life of the motor and the service life of a brake system are influenced because the motor is frequently started and stopped.
Optionally, in another embodiment of the present invention, as shown in fig. 4, an implementation manner of step S203 includes:
s401, in a first preset time, disconnecting the shutoff solenoid valve and the pressure maintaining solenoid valve, and controlling the proportional solenoid valve according to a preset requirement.
The preset requirement may be changed according to an actual application scenario, and is not limited herein.
S402, enabling the pressure maintaining electromagnetic valve within a second preset time, and controlling the proportional electromagnetic valve according to half of a preset requirement; and adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder.
In this step, firstly, the pressure maintaining solenoid valve is controlled to be powered on, the proportional solenoid valve is controlled according to half of the preset requirement, whether the difference value between the brake cylinder pressure value output by the current proportional solenoid valve and the brake cylinder pressure value threshold value is within a reasonable range or not is judged, if the difference value between the brake cylinder pressure value output by the current proportional solenoid valve and the brake cylinder pressure value threshold value is within the reasonable range, the solenoid valve is enabled to be interrupted, and step S403 is executed; if the difference value between the brake cylinder pressure value output by the current proportional solenoid valve and the brake cylinder pressure value threshold is not within the reasonable range, the solenoid valve is enabled to be interrupted after the difference value between the brake cylinder pressure value output by the current proportional solenoid valve and the brake cylinder pressure value threshold is adjusted to be within the reasonable range, and step S403 is executed.
S403, within a third preset time, the proportional solenoid valve is powered off, and the pressure maintaining solenoid valve is enabled; and adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder.
In the step, firstly, the proportional solenoid valve is controlled to lose power, and the pressure maintaining solenoid valve is enabled; judging whether the difference value between the current brake cylinder pressure value and the brake cylinder pressure value threshold is within a reasonable range or not, if so, enabling the solenoid valve to be interrupted, and executing the step S404; if the difference value between the current brake cylinder pressure value and the brake cylinder pressure value threshold is not within the reasonable range, the electromagnetic valve is enabled to be interrupted after the difference value between the current brake cylinder pressure value and the brake cylinder pressure value threshold is adjusted to be within the reasonable range, and step S404 is executed.
And S404, enabling the shutoff solenoid valve and the pressure maintaining solenoid valve simultaneously in a fourth preset time.
It should be noted that, at this time, the proportional solenoid valve is completely de-energized, so as to avoid internal leakage in the subsequent leakage test.
The first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence; for example: the first preset time is 0-5S in the pressure adjusting process, the second preset time is 5-8S in the pressure adjusting process, the third preset time is 8-12S in the pressure adjusting process, and the fourth preset time is after 12S in the pressure adjusting process; the time period may be adjusted according to a specific application scenario, and is not limited herein.
And S204, if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the accumulator and the brake cylinder have leakage faults or not.
Specifically, when the pressure value of the brake cylinder is adjusted to the preset leakage test requirement, the leakage test is started, and the trisection point of the whole test time can be selected as the test result, because if leakage exists, the leakage process is a continuous process when the electromagnetic valve does not act. Therefore, the whole leakage test process is divided into three sections for testing, and the phenomenon that the leakage test result is misjudged and the leakage fault is misreported due to the fact that the sensor acquisition interference, the hydraulic clamp interference and other factor interference occur in the test process can be avoided, and therefore the accuracy of the detection result is influenced.
Optionally, in another embodiment of the present invention, as shown in fig. 5, an implementation manner of step S204 includes:
and S501, recording the pressure value of the energy accumulator at preset time intervals.
The preset time may be adjusted according to a specific application scenario, which is not limited herein.
And S502, calculating the pressure difference of the energy accumulator in the adjacent time.
S503, if the pressure difference of the accumulator is larger than the pressure difference threshold value of the accumulator, the accumulator is indicated to have a leakage fault in the corresponding time period.
In this step, the two obtained values may be judged according to the simplest logical judgment, and this is not limited here.
Optionally, in another embodiment of the present invention, as shown in fig. 6, an implementation manner of step S204 includes:
and S601, recording the pressure value of the brake cylinder at preset time intervals.
The preset time may be adjusted according to a specific application scenario, which is not limited herein.
And S602, calculating the pressure difference of the brake cylinders in adjacent time.
And S603, if the pressure difference of the brake cylinder is larger than the pressure difference threshold value of the brake cylinder, indicating that the brake cylinder has a leakage fault in the corresponding time period.
In this step, the two obtained values may be judged according to the simplest logical judgment, and this is not limited here.
In fig. 5 and 6, the two embodiments of whether the leak failure occurs in the accumulator and the brake cylinder may be performed at the same time or may not be performed at the same time in the actual application process.
And S205, if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault.
According to the scheme, in the leakage detection method of the brake system, firstly, a leakage test instruction is received; then, judging whether the brake system is in a stop state or not; when the brake system is judged to be in a stop state, pressure adjustment is carried out on the brake cylinder; if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the energy accumulator and the brake cylinder have leakage faults or not; and if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault. Therefore, the method for automatically and intelligently detecting the leakage of the brake system is realized.
Optionally, in another embodiment of the present invention, after step S104, the following steps may be further included:
and reporting the leakage fault to a server.
By reporting the leakage fault to the server, a worker can timely see that the current brake system has the leakage fault, so that the leakage fault of the brake system is processed at the first time, the oil leakage is minimized, and the pollution to the environment is reduced; meanwhile, specific data information of the leakage fault can be reported to the server, so that follow-up scientific research personnel, expert groups and the like can analyze the fault conveniently, improvement is made, and the leakage fault of the brake system is avoided to the maximum extent.
Another embodiment of the present invention provides a leak detection apparatus of a brake system, as shown in fig. 7, including:
a receiving unit 701, configured to receive a leak test instruction.
A first judging unit 702, configured to judge whether the brake system is in a stopped state.
Optionally, in another embodiment of the present invention, an implementation manner of the first determining unit 702, as shown in fig. 8, includes:
an engine speed determination unit 801 is used for determining whether the current engine speed is zero.
The traction force determination unit 802 determines whether the current traction force is zero or not if the engine speed determination unit 801 determines that the current engine speed is zero.
If the traction determining unit 802 determines that the current traction is zero, it indicates that the braking system is in a stopped state.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 3, which is not described herein again.
And a pressure adjusting unit 703 configured to adjust the pressure of the brake cylinder if the first determining unit 702 determines that the brake system is in a stopped state.
Optionally, in another embodiment of the present invention, as shown in fig. 9, an implementation manner of the first determining unit 703 includes:
the first control unit 901 is configured to disconnect the shutoff solenoid valve and the pressure maintaining solenoid valve within a first preset time, and control the proportional solenoid valve according to a preset requirement.
The first adjusting unit 902 is configured to enable the pressure maintaining solenoid valve within a second preset time, and control the proportional solenoid valve according to a half of a preset requirement; and adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder.
The second adjusting unit 903 is used for powering off the proportional solenoid valve and enabling the pressure maintaining solenoid valve within a third preset time; and adjusting the current pressure value of the brake cylinder to be within a reasonable range of the pressure threshold value of the brake cylinder.
And a second control unit 904 for simultaneously enabling the shutoff solenoid valve and the pressure maintaining solenoid valve for a fourth preset time.
The first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 4, which is not described herein again.
And the second judging unit 704 is configured to judge whether a leakage fault occurs in the accumulator and the brake cylinder if the pressure value of the brake cylinder meets the leakage test requirement.
Optionally, in another embodiment of the present invention, an implementation manner of the second determining unit 704, as shown in fig. 10, includes:
an accumulator determination unit 1010 and a brake cylinder determination unit 1020.
The accumulator determination unit 1010 includes:
the first recording unit 1011 is configured to record the pressure value of the accumulator at preset time intervals.
A first calculation unit 1012 for calculating the pressure difference of the accumulators in adjacent times.
The first failure confirming unit 1013 is configured to, if the pressure difference of the accumulator is greater than the pressure difference threshold of the accumulator, indicate that a leakage failure occurs in the accumulator in a corresponding time period.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 5, which is not described herein again.
The brake cylinder determination unit 1020 includes:
and a second recording unit 1021 for recording the pressure value of the brake cylinder at preset time intervals.
A second calculating unit 1022, configured to calculate a pressure difference of the brake cylinders in adjacent time periods.
The second failure confirmation unit 1023 is configured to, if the pressure difference of the brake cylinder is greater than the pressure difference threshold of the brake cylinder, indicate that the brake cylinder has a leakage failure in a corresponding time period.
For a specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 6, which is not described herein again.
A confirming unit 705, configured to indicate that a leakage fault occurs in the brake system if the second determining unit 704 determines that a leakage fault occurs in any one of the accumulator and the brake cylinder.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, as shown in fig. 2, which is not described herein again.
Optionally, in another embodiment of the present invention, the leakage detecting apparatus for a brake system may further include:
and the reporting unit is used for reporting the leakage fault to the server.
For the specific working process of the unit disclosed in the above embodiment of the present invention, reference may be made to the content of the corresponding method embodiment, which is not described herein again.
As can be seen from the above, in the leak detection device for a brake system according to the present invention, first, the receiving unit 701 receives a leak test command; then, whether the brake system is in a stopped state is judged by the first judgment unit 702; when the brake system is judged to be in a stop state, the pressure of the brake cylinder is adjusted through the pressure adjusting unit 703; if the pressure value of the brake cylinder meets the leakage test requirement, a second judgment unit 704 is utilized to judge whether the leakage fault occurs to the accumulator and the brake cylinder; if it is determined that any one of the accumulator and the brake cylinder has a leakage fault, the determination unit 705 determines that the brake system has a leakage fault. Therefore, the method for automatically and intelligently detecting the leakage of the brake system is realized.
Those skilled in the art can make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of leak detection in a brake system, comprising:
receiving a leakage test instruction;
judging whether the brake system is in a stop state or not;
if the brake system is judged to be in a stop state, pressure adjustment is carried out on the brake cylinder;
if the pressure value of the brake cylinder meets the leakage test requirement, judging whether the energy accumulator and the brake cylinder have leakage faults or not;
and if any one of the accumulator and the brake cylinder is judged to have a leakage fault, the brake system is indicated to have the leakage fault.
2. The method of claim 1, wherein the determining whether the brake system is in a stopped state comprises:
judging whether the current speed of the engine is zero or not;
if the speed of the current engine is judged to be zero, judging whether the current traction force is zero or not;
and if the current traction force is judged to be zero, the brake system is in a stop state.
3. The method of claim 1, wherein the pressure regulating the brake cylinder comprises:
in a first preset time, disconnecting the interruption solenoid valve and the pressure maintaining solenoid valve, and controlling the proportional solenoid valve according to a preset requirement;
enabling the pressure maintaining electromagnetic valve within a second preset time, and controlling the proportional electromagnetic valve according to half of the preset requirement; adjusting the current pressure value of the brake cylinder to be within a reasonable range of a brake cylinder pressure value threshold value;
within a third preset time, the proportional solenoid valve is powered off, and the pressure maintaining solenoid valve is enabled; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the threshold value of the pressure value of the brake cylinder;
enabling the interruption solenoid valve and the pressure maintaining solenoid valve simultaneously within a fourth preset time;
the first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence.
4. The method of claim 1, wherein the determining whether a leak fault has occurred in the accumulator and the brake cylinder comprises:
recording the pressure value of the energy accumulator at preset time intervals;
calculating the pressure difference of the energy accumulators in adjacent time;
if the pressure difference of the energy accumulator is greater than the pressure difference threshold value of the energy accumulator, indicating that the energy accumulator has a leakage fault in a corresponding time period;
the judging of whether the brake cylinder has the leakage fault in the judging of whether the accumulator and the brake cylinder have the leakage fault includes:
recording the pressure value of the brake cylinder at preset time intervals;
calculating the pressure difference of the brake cylinders in adjacent time;
if the pressure difference of the brake cylinder is larger than the pressure difference threshold value of the brake cylinder, the brake cylinder is indicated to have a leakage fault in a corresponding time period.
5. The method of claim 1, wherein if it is determined that a leak fault has occurred in either one of the accumulator and the brake cylinder, indicating that the brake system has a leak fault, further comprising: and reporting the leakage fault to a server.
6. A leak detection device for a brake system, comprising:
a receiving unit for receiving a leak test instruction;
the first judgment unit is used for judging whether the brake system is in a stop state or not;
the pressure adjusting unit is used for adjusting the pressure of the brake cylinder if the brake system is in a stop state judged by the first judging unit;
the second judgment unit is used for judging whether the energy accumulator and the brake cylinder have leakage faults or not if the pressure value of the brake cylinder meets the leakage test requirement;
and the confirming unit is used for indicating that the brake system has a leakage fault if any one of the accumulator and the brake cylinder has the leakage fault according to the judgment of the second judging unit.
7. The apparatus according to claim 6, wherein the first determining unit comprises:
an engine speed judgment unit for judging whether the current engine speed is zero;
the traction judging unit is used for judging whether the current traction is zero or not if the engine speed judging unit judges that the current engine speed is zero;
if the traction judging unit judges that the current traction is zero, the braking system is in a stop state.
8. The apparatus of claim 6, wherein the pressure regulating unit comprises:
the first control unit is used for disconnecting the interruption solenoid valve and the pressure maintaining solenoid valve within first preset time and controlling the proportional solenoid valve according to preset requirements;
the first adjusting unit is used for enabling the pressure maintaining electromagnetic valve within a second preset time and controlling the proportional electromagnetic valve according to half of the preset requirement; adjusting the current pressure value of the brake cylinder to be within a reasonable range of a brake cylinder pressure value threshold value;
the second adjusting unit is used for enabling the proportional solenoid valve to be powered off and the pressure maintaining solenoid valve to be enabled within a third preset time; adjusting the current pressure value of the brake cylinder to be within a reasonable range of the threshold value of the pressure value of the brake cylinder;
the second control unit is used for enabling the interruption solenoid valve and the pressure maintaining solenoid valve simultaneously within a fourth preset time;
the first preset time, the second preset time, the third preset time and the fourth preset time are four time periods according to the time sequence.
9. The apparatus of claim 6, wherein the second determining unit comprises:
the brake system comprises an energy accumulator judging unit and a brake cylinder judging unit;
the accumulator determination unit includes:
the first recording unit is used for recording the pressure value of the energy accumulator at intervals of preset time;
a first calculation unit for calculating a pressure difference of the accumulators at adjacent times;
the first fault confirming unit is used for indicating that the accumulator has a leakage fault in a corresponding time period if the pressure difference of the accumulator is greater than the pressure difference threshold value of the accumulator;
the brake cylinder determination unit includes:
the second recording unit is used for recording the pressure value of the brake cylinder at intervals of preset time;
the second calculation unit is used for calculating the pressure difference of the brake cylinders in adjacent time;
and the second fault confirming unit is used for indicating that the brake cylinder has a leakage fault in a corresponding time period if the pressure difference of the brake cylinder is greater than the pressure difference threshold value of the brake cylinder.
10. The apparatus of claim 6, further comprising:
and the reporting unit is used for reporting the leakage fault to a server.
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| CN111976694B (en) * | 2020-07-08 | 2021-07-06 | 嘉善新石器智牛科技有限公司 | Brake fluid leakage detection method and device and unmanned vehicle |
| CN114248748B (en) * | 2020-09-25 | 2023-03-24 | 比亚迪股份有限公司 | Method and device for detecting leakage of brake system of vehicle |
| CN113418663A (en) * | 2020-12-31 | 2021-09-21 | 湖南江河机电自动化设备股份有限公司 | Hydraulic turbine governor hydraulic system leakage detection method |
| CN112880918B (en) * | 2021-01-12 | 2023-05-12 | 首钢京唐钢铁联合有限责任公司 | Method and device for detecting leakage of hydraulic equipment |
| CN113514262A (en) * | 2021-07-15 | 2021-10-19 | 中车青岛四方机车车辆股份有限公司 | Braking function testing method, system, storage medium and equipment |
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Effective date of registration: 20220810 Address after: 266000 south side of Xinye road and west side of Herong Road, Qingdao high tech Industrial Development Zone, Qingdao, Shandong Province Patentee after: CRRC Brake System Co.,Ltd. Address before: 412001 Tianxin garden in Shi Feng District, Zhuzhou, Hunan Patentee before: CRRC ZHUZHOU LOCOMOTIVE Co.,Ltd. |