CN112776789B - Brake vacuum power system leakage diagnosis method and system and storage medium - Google Patents
Brake vacuum power system leakage diagnosis method and system and storage medium Download PDFInfo
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- CN112776789B CN112776789B CN201911089422.XA CN201911089422A CN112776789B CN 112776789 B CN112776789 B CN 112776789B CN 201911089422 A CN201911089422 A CN 201911089422A CN 112776789 B CN112776789 B CN 112776789B
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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
Abstract
The invention relates to a brake vacuum power system leakage diagnosis method, a brake vacuum power system leakage diagnosis system and a storage medium, wherein the method comprises the following steps: obtaining and determining a diagnosis strategy according to a brake pedal state signal and a vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis; executing the diagnostic strategy; and if the diagnosis is carried out, monitoring the first time consumed by the pressure in the current booster to rise from the first pressure value to the second pressure value and the second time consumed by the pressure in the current booster to fall from the second pressure value to the first pressure value in real time, and determining the system leakage grade according to the comparison result of the first time and the preset value and the comparison result of the second time and the preset value. The system corresponds to the method and is a carrier for realizing the method; the storage medium is a computer-readable storage medium having stored thereon a computer program for implementing the method. The invention can diagnose the booster and prompt the fault of the system leakage state through the instrument, thereby improving the driving safety of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a brake vacuum power system leakage diagnosis method, a brake vacuum power system leakage diagnosis system and a storage medium.
Background
At present, the traditional fuel vehicle brake vacuum booster mainly provides vacuum degree through an engine intake manifold, the vacuum degree is provided by the intake manifold directly for a vehicle adopting a naturally aspirated engine in a typical scheme, and a vacuum pump (mechanical or electric) is added for assistance on the basis of the intake manifold for a supercharged engine adopting a supercharger. In new energy vehicle types (such as hybrid vehicle types and pure electric vehicle types), the vacuum degree required by the braking vacuum boosting system needs to be completely provided by an electric vacuum pump because an engine does not exist. The traditional vehicle type provides vacuum degree through an intake manifold or a vacuum pump, does not perform related diagnosis on a booster or only performs diagnosis on a relay control pin. When the system leaks, the system cannot provide enough braking assistance, a user cannot know the current system fault, and the user can only find the condition that the pedal feels hard or cannot be stepped on when the user performs braking operation. The new forms of energy motorcycle type adopts electric vacuum pump to provide the vacuum, only diagnoses the relay and takes notes the fault code, does not warn through the instrument. When the system leaks, the system only records the fault code and does not warn, so that the system fault can be found only after the user is abnormal in the vehicle using process.
Disclosure of Invention
The invention aims to provide a brake vacuum power system leakage diagnosis method, a brake vacuum power system leakage diagnosis system and a storage medium, so that a booster can be diagnosed, fault prompt of a system leakage state can be carried out through an instrument, and the driving safety of a vehicle can be improved.
In a first aspect, an embodiment of the present invention provides a brake vacuum power system leakage diagnosis method, including the following steps:
obtaining and determining a diagnosis strategy according to a brake pedal state signal and a vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
executing the diagnostic policy; if the diagnosis is carried out, monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value and second time consumed by the fact that the pressure in the current booster falls from the second pressure value to the first pressure value in real time; determining a static leakage grade according to a comparison result of the first time and a preset value; determining the dynamic leakage grade according to the comparison result of the second time and a preset value; selecting one of the static leakage grade and the dynamic leakage grade with higher leakage grade as a system leakage grade;
wherein the determining the static leakage level according to the comparison result of the first time and the preset value comprises: when the first time is greater than a first preset value T1, the static leakage grade is 0; when the first time is greater than a second preset value T2 and less than or equal to a first preset value T1, the static leakage grade is 1; when the first time is greater than a third preset value T3 and less than or equal to a second preset value T2, the static leakage grade is 2;
wherein the determining the dynamic leakage level according to the comparison result of the second time with the preset value comprises: when the second time is less than or equal to a fifth preset value T5, the dynamic leakage grade is 0; when the second time is greater than a fifth preset value T5 and less than or equal to a sixth preset value T6, the dynamic leakage grade is 1; and when the second time is greater than the sixth preset value T6 and less than or equal to the seventh preset value T7, the dynamic leakage grade is 2.
Wherein the performing diagnostics includes performing static diagnostics and performing dynamic diagnostics;
when the brake pedal state signal is 1, no diagnosis is performed;
when the brake pedal state signal is 0 and the vacuum pump enable state signal is 0, performing static diagnosis, and monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value in real time;
and when the brake pedal state signal is 0 and the vacuum pump enabling state signal is 1, performing dynamic diagnosis, and monitoring second time consumed by the fact that the pressure in the current booster is reduced from the second pressure value to the first pressure value in real time.
Wherein the generating a static leakage grade according to the comparison result of the first time and a preset value comprises:
when the first time is greater than a fourth preset value and less than or equal to a third preset value, the dynamic leakage grade is 3;
when the first time is less than or equal to a fourth preset value, the dynamic leakage grade is 4;
wherein the determining the dynamic leakage level according to the comparison result of the second time and the preset value comprises:
when the second time is greater than a seventh preset value and less than or equal to an eighth preset value, the static leakage grade is 3;
and when the second time is greater than an eighth preset value, the static leakage grade is 4.
Wherein the method further comprises the steps of:
when the vehicle is powered on, the vacuum boosting system carries out self-checking, if the self-checking result is normal, leakage diagnosis is allowed to be carried out, and if not, leakage diagnosis is not carried out.
Wherein the method further comprises the steps of:
generating a system leakage state signal according to the system leakage grade;
and controlling a fault code recording unit to record a fault code according to the system leakage state signal, carrying out fault indication by a vehicle-mounted indicating lamp, displaying fault information by a vehicle-mounted display and/or carrying out voice alarm by a vehicle-mounted alarm device.
In a second aspect, an embodiment of the present invention provides a brake vacuum power system leakage diagnosis system, which is used to implement the brake vacuum power system leakage diagnosis method according to the embodiment of the present invention, and the system includes:
a diagnostic manner determination unit configured to acquire and determine a diagnostic strategy according to the brake pedal state signal and the vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
an execution unit configured to execute the diagnostic policy; if the diagnosis is carried out, monitoring the first time consumed by the pressure in the current booster to rise from the first pressure value to the second pressure value and the second time consumed by the pressure in the current booster to fall from the second pressure value to the first pressure value in real time; determining a static leakage grade according to a comparison result of the first time and a preset value; determining the dynamic leakage grade according to the comparison result of the second time and a preset value; selecting one of the static leakage grade and the dynamic leakage grade with higher leakage grade as a system leakage grade;
wherein the determining the static leakage level according to the comparison result of the first time and the preset value comprises: when the first time is greater than a first preset value T1, the static leakage grade is 0; when the first time is greater than a second preset value T2 and less than or equal to a first preset value T1, the static leakage grade is 1; when the first time is greater than a third preset value T3 and less than or equal to a second preset value T2, the static leakage grade is 2;
wherein the determining the dynamic leakage level according to the comparison result of the second time and the preset value comprises: when the second time is less than or equal to a fifth preset value T5, the dynamic leakage grade is 0; when the second time is greater than a fifth preset value T5 and less than or equal to a sixth preset value T6, the dynamic leakage grade is 1; and when the second time is greater than the sixth preset value T6 and less than or equal to the seventh preset value T7, the dynamic leakage grade is 2.
Wherein the system comprises:
and the detection unit is used for carrying out self-detection on the vacuum boosting system when the vehicle is powered on, allowing leakage diagnosis if the self-detection result is normal, and not carrying out leakage diagnosis if the self-detection result is normal.
Wherein the system comprises:
the leakage state signal generating unit is used for generating a system leakage state signal according to the system leakage grade;
and the leakage warning unit is used for controlling the fault code recording unit to record fault codes according to the system leakage state signal, carrying out fault indication by the vehicle-mounted indicating lamp, displaying fault information by the vehicle-mounted display and/or carrying out voice alarm by the vehicle-mounted alarm equipment.
In a third aspect, the embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the brake vacuum power system leak diagnosis method according to the embodiments of the present invention.
The embodiment of the invention provides a brake vacuum power system leakage diagnosis method, a brake vacuum power system leakage diagnosis system and a storage medium, wherein the brake vacuum power system leakage diagnosis is carried out through the pressure value in a vacuum booster and the system operation condition, the system operation condition signal comprises a brake pedal state signal and a vacuum pump enabling state signal, and the leakage condition of the brake vacuum power system is accurately identified according to preset diagnosis strategies under different working conditions. Furthermore, corresponding warning information can be output according to the leakage severity. The brake vacuum boosting system is used as an important component of the brake system, when a leakage fault occurs, the fault and the severity can be rapidly and accurately identified through the technical scheme of the embodiment of the invention, fault indication is carried out through the vehicle-mounted indicating lamp in real time, fault information is displayed through the vehicle-mounted display, and/or voice alarm is carried out by the vehicle-mounted alarm device to prompt a user, so that the user can timely receive risk prompt and carry out emergency treatment in advance.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. Of course, it is not necessary for any product or method to achieve all of the above-described advantages at the same time for practicing the invention.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a brake vacuum power system leakage diagnosis method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of three-dimensional data of the pumping characteristics of the vacuum pump under different voltage values according to an embodiment of the present invention.
FIG. 3 is a block diagram of a brake vacuum power system leak diagnostic system according to a second embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In addition, numerous specific details are set forth in the following description of specific embodiments in order to provide a thorough description of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means within the skill of those in the art have not been described in detail so as not to obscure the invention.
Example one
The embodiment of the invention provides a brake vacuum power system leakage diagnosis method, fig. 1 is a flow chart of the method, and referring to fig. 1, the method comprises the following steps:
s101, obtaining and determining a diagnosis strategy according to a brake pedal state signal and a vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
step S201, executing the diagnosis strategy; if the diagnosis is carried out, monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value and second time consumed by the fact that the pressure in the current booster falls from the second pressure value to the first pressure value in real time, and determining the leakage grade of the system according to a comparison result of the first time and a preset value and a comparison result of the second time and the preset value.
Specifically, in the embodiment, in the power-on operation process of the vehicle, a brake pedal state signal and a vacuum pump enabling state signal are acquired in real time, then the brake pedal state signal and the vacuum pump enabling state signal are comprehensively judged, and a diagnosis strategy is determined, wherein the diagnosis strategy comprises diagnosis and non-diagnosis. The method includes the steps that a pressure sensor is arranged inside a booster and used for monitoring pressure values inside the booster in real time, monitoring signals, namely the pressure values, from the pressure sensor are obtained in real time in a diagnosis process, the obtained first time or second time is compared with preset values to obtain comparison results, the number of the preset values is multiple, and system leakage grades are determined according to the comparison results of the first time and the preset values and the comparison results of the second time and the preset values.
It can be understood that, in the embodiment, the pressure sensor is used for monitoring the internal pressure state of the booster, and no additional component is required on a vehicle model equipped with an electric vacuum pump system (which is accompanied by a brake vacuum pressure sensor), and the system leakage condition can be monitored and diagnosed only by adding a software module.
For the setting of the preset value, the present embodiment first obtains the pressure change characteristic of the braking vacuum boosting system through calibration of the rack (the rack is built according to the scheme adopted by the real vehicle), and then sets the preset value according to the pressure change characteristic.
The diagnosis strategy for diagnosis specifically comprises performing static diagnosis and performing dynamic diagnosis; specifically, the step determines whether to implement a static diagnostic strategy or a dynamic diagnostic strategy based on the brake pedal status signal and the vacuum pump enable status signal.
Wherein the performing diagnostics includes performing static diagnostics and performing dynamic diagnostics;
when the brake pedal state signal is 1, the diagnosis is not performed;
when the brake pedal state signal is 0 and the vacuum pump enabling state signal is 0, performing static diagnosis, and monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value in real time;
and when the brake pedal state signal is 0 and the vacuum pump enabling state signal is 1, performing dynamic diagnosis, and monitoring second time consumed by the fact that the pressure in the current booster is reduced from the second pressure value to the first pressure value in real time.
Specifically, the brake pedal state signal is 1, which indicates that the brake pedal is pressed down and the current driver is performing the braking operation; the brake pedal status signal is 0, indicating that the brake pedal is not depressed and no braking operation is currently performed. The enabling is a 'permission' signal, the vacuum pump enabling is a signal for allowing the vacuum pump to work, namely the vacuum pump can work when the vacuum pump enabling signal is effective, and the vacuum pump enabling state signal is 1, which indicates that the vacuum pump is allowed to work; the vacuum pump enable status signal is 0, indicating that the vacuum pump is not allowed to operate.
Wherein the step S102 includes:
determining a static leakage grade according to a comparison result of the first time and a preset value;
determining the dynamic leakage grade according to the comparison result of the second time and a preset value;
and determining the system leakage grade according to the static leakage grade and the dynamic leakage grade, and selecting one of the static leakage grade and the dynamic leakage grade with a higher leakage grade as the system leakage grade.
Specifically, during the diagnosis process, the brake pedal state signal and the vacuum pump enable state signal may change at any time, and the diagnosis process is exited when the brake pedal state signal changes from 1 to 0, and is entered when the brake pedal state signal changes from 0 to 1. When the diagnosis process is executed, when the vacuum pump enable state signal is 0, static diagnosis is carried out to obtain a static leakage grade, when the vacuum pump enable state signal is 1, dynamic diagnosis is carried out to obtain a dynamic leakage grade, and the system leakage grade is determined according to the static leakage grade and the dynamic leakage grade.
In an embodiment, the determining the static leakage level according to the comparison result of the first time and the preset value includes:
when the first time is greater than a first preset value T1, the static leakage grade is 0;
when the first time is greater than the second preset value T2 and less than or equal to the first preset value T1, the static leakage grade is 1;
when the first time is greater than the third preset value T3 and less than or equal to the second preset value T2, the static leakage grade is 2;
when the first time is greater than the fourth preset value T4 and less than or equal to the third preset value T3, the static leakage grade is 3;
when the first time is less than or equal to a fourth preset value T4, the static leakage grade is 4;
the determining the dynamic leakage grade according to the comparison result of the second time and the preset value comprises:
when the second time is less than or equal to a fifth preset value T5, the dynamic leakage grade is 0;
when the second time is greater than a fifth preset value T5 and less than or equal to a sixth preset value T6, the dynamic leakage grade is 1;
when the second time is greater than the sixth preset value T6 and less than or equal to the seventh preset value T7, the dynamic leakage grade is 2;
when the second time is greater than the seventh preset value T7 and less than or equal to the eighth preset value T8, the dynamic leakage grade is 3;
when the second time is greater than the eighth preset value T8, the dynamic leakage level is 4.
Specifically, the selection process of the preset value in this embodiment is as follows:
a) the air suction characteristics of the vacuum pump under different voltage values are obtained through bench measurement, a 3-dimensional data map is formed, as shown in fig. 2, table 1 is filled in to record relevant data, and each cell in table 1 respectively represents characteristic data of air suction from the ambient pressure to the maximum vacuum degree under the current condition.
TABLE 1 air extraction characteristics (air extraction time t/s)
b) Starting a vacuum pump to pump until the interior of the booster reaches the lowest pressure, stopping pumping, respectively simulating the air leakage conditions of the apertures phi 1.0mm, phi 1.5mm, phi 2.0mm and phi 2.5mm on the pipeline, acquiring data and filling in a table 2.
TABLE 2 XXmm Aperture leak characteristics (static)
c) Starting a vacuum pump to pump until the interior of the booster reaches the lowest pressure, continuously operating, respectively simulating the air leakage conditions of the apertures phi 1.0mm, phi 1.5mm, phi 2.0mm and phi 2.5mm on the pipeline, acquiring data and filling in a table 3.
TABLE 3 XXmm Aperture puncture Properties (dynamic)
According to the characteristic data of the steps a), b) and c), selecting 25kPa-50kPa as a characteristic interval, namely the first pressure value is 25kPa, the second pressure value is 50kPa, and respectively obtaining static and dynamic judgment parameters. The static parameter is the time that booster internal pressure rises to 55kPa from 25kPa under the different aperture gas leakage circumstances, and the dynamic parameter is the time that booster internal pressure descends to 25kPa from 55kPa under the different aperture gas leakage circumstances, see table 4 below:
TABLE 4 determination parameters
| Φ1mm | Φ1.5mm | Φ2mm | Φ2.5mm | |
| Static state | T1 | T2 | T3 | T4 |
| Dynamic state | T5 | T6 | T7 | T8 |
Therefore, in this embodiment, the leakage level is actually set according to the size of the aperture of the leakage, and in this embodiment, the leakage levels 1 to 4 are set by four apertures Φ 1.0mm, Φ 1.5mm, Φ 2.0mm, and Φ 2.5 mm.
In one embodiment, the method further comprises the steps of:
and S100, when the vehicle is powered on, the vacuum boosting system carries out self-checking, if the self-checking result is normal, leakage diagnosis is allowed to be carried out, and otherwise, leakage diagnosis is not carried out.
Specifically, whether the brake switch diagnosis state, the vacuum pressure sensor diagnosis state and the vacuum pump relay control state are normal or not is detected and judged, and the leakage diagnosis of the vacuum power assisting system is allowed only after the component states of the vacuum power assisting system are confirmed to be normal, otherwise, the leakage diagnosis of the vacuum power assisting system is not performed.
In one embodiment, the method further comprises the steps of:
step S201, generating a system leakage state signal according to a system leakage grade;
step S202, controlling a fault code recording unit to record fault codes according to the system leakage state signal, carrying out fault indication by a vehicle-mounted indicating lamp, displaying fault information by a vehicle-mounted display and/or carrying out voice alarm by vehicle-mounted alarm equipment.
Specifically, in the step, whether to record a fault code or not, whether to light a fault lamp of a brake system or not and perform reminding such as display and voice alarm and the like are determined according to the system leakage grade. The specific signal comprehensive calculation method and the related warning strategy are shown in table 5 below.
TABLE 5 System leak level and corresponding strategy
In the prior art, the method provided by the embodiment of the invention is additionally provided with leakage diagnosis of the brake vacuum power-assisted system, so that the state of the brake power-assisted system can be monitored in real time; the controller diagnoses the leakage fault of the brake boosting system, and warns a user through the instrument, so that the risk caused by the performance reduction or failure of the boosting system is avoided.
It should be noted that steps S101, S201, etc. are merely step names herein, which are used to represent corresponding steps, and do not limit the flow of step execution.
Example two
A second embodiment of the present invention provides a brake vacuum power system leakage diagnosis system, which corresponds to the first embodiment of the method, and is used for implementing the first embodiment of the brake vacuum power system leakage diagnosis method of the present invention, and fig. 3 is a frame diagram of the second embodiment of the system, referring to fig. 3, the system includes:
a diagnostic mode determination unit 1 configured to acquire and determine a diagnostic strategy according to the brake pedal state signal and the vacuum pump enable state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
an execution unit 2 configured to execute the diagnostic policy; and if the diagnosis is carried out, monitoring the first time consumed by the pressure in the current booster to rise from the first pressure value to the second pressure value and the second time consumed by the pressure in the current booster to fall from the second pressure value to the first pressure value in real time, and determining the system leakage grade according to the comparison result of the first time and the preset value and the comparison result of the second time and the preset value.
Wherein the system comprises:
and the detection unit 3 is used for performing self-detection on the vacuum boosting system when the vehicle is powered on, allowing leakage diagnosis if the self-detection result is normal, and not performing leakage diagnosis if the self-detection result is normal.
Wherein the system comprises:
a leakage state signal generating unit 4, configured to generate a system leakage state signal according to the system leakage level;
and the leakage warning unit 5 is used for controlling the fault code recording unit to record the fault code, the vehicle-mounted indicating lamp to indicate the fault, the vehicle-mounted display to display the fault information and/or the vehicle-mounted alarm equipment to give out a voice alarm according to the system leakage state signal.
It should be noted that the system according to the second embodiment corresponds to the method according to the first embodiment, and therefore, the part of the system according to the second embodiment that is not described in detail can be obtained by referring to the content of the method according to the first embodiment, and is not described again here.
It should be noted that, based on the content in this document, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented by software and necessary general hardware, and certainly can be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the embodiments of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to implement the method/system described in the foregoing embodiments.
EXAMPLE III
The third embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the brake vacuum power system leakage diagnosis method of the first embodiment.
While embodiments of the present invention have been described above, the above description is illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the market, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A brake vacuum power system leak diagnosis method is characterized by comprising the following steps:
obtaining and determining a diagnosis strategy according to a brake pedal state signal and a vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
executing the diagnostic strategy; if the diagnosis is carried out, monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value and second time consumed by the fact that the pressure in the current booster falls from the second pressure value to the first pressure value in real time; determining a static leakage grade according to a comparison result of the first time and a preset value; determining the dynamic leakage grade according to the comparison result of the second time and a preset value; selecting one of the static leakage grade and the dynamic leakage grade with higher leakage grade as a system leakage grade;
wherein the determining the static leakage level according to the comparison result of the first time and the preset value comprises: when the first time is greater than a first preset value T1, the static leakage grade is 0; when the first time is greater than a second preset value T2 and less than or equal to a first preset value T1, the static leakage grade is 1; when the first time is greater than a third preset value T3 and less than or equal to a second preset value T2, the static leakage grade is 2;
the determining the dynamic leakage grade according to the comparison result of the second time and the preset value comprises: when the second time is less than or equal to a fifth preset value T5, the dynamic leakage grade is 0; when the second time is greater than a fifth preset value T5 and less than or equal to a sixth preset value T6, the dynamic leakage grade is 1; and when the second time is greater than a sixth preset value T6 and less than or equal to a seventh preset value T7, the dynamic leakage grade is 2.
2. The brake vacuum power system leak diagnostic method of claim 1,
when the brake pedal state signal is 1, the diagnosis is not performed;
when the brake pedal state signal is 0 and the vacuum pump enable state signal is 0, performing static diagnosis, and monitoring first time consumed by the fact that the pressure in the current booster rises from a first pressure value to a second pressure value in real time;
and when the brake pedal state signal is 0 and the vacuum pump enabling state signal is 1, performing dynamic diagnosis, and monitoring second time consumed by the fact that the pressure in the current booster is reduced from the second pressure value to the first pressure value in real time.
3. The brake vacuum power system leak diagnostic method of claim 2,
wherein the determining the static leak level according to the comparison of the first time with the preset value further comprises:
when the first time is greater than a fourth preset value T4 and less than or equal to a third preset value T3, the static leakage grade is 3;
when the first time is less than or equal to a fourth preset value T4, the static leakage grade is 4;
wherein the determining the dynamic leakage level according to the comparison result of the second time and the preset value further comprises:
when the second time is greater than a seventh preset value T7 and less than or equal to an eighth preset value T8, the dynamic leakage grade is 3;
and when the second time is greater than an eighth preset value T8, the dynamic leakage grade is 4.
4. The brake vacuum power system leak diagnostic method of any one of claims 1-3, further comprising the steps of:
when the vehicle is powered on, the vacuum boosting system carries out self-checking, if the self-checking result is normal, leakage diagnosis is allowed to be carried out, and if not, leakage diagnosis is not carried out.
5. The brake vacuum power system leak diagnostic method of any one of claims 1 to 3, further comprising the steps of:
generating a system leakage state signal according to the system leakage grade;
and controlling a fault code recording unit to record a fault code according to the system leakage state signal, carrying out fault indication by a vehicle-mounted indicating lamp, displaying fault information by a vehicle-mounted display and/or carrying out voice alarm by a vehicle-mounted alarm device.
6. A brake vacuum power system leak diagnostic system for implementing the brake vacuum power system leak diagnostic method of any one of claims 1 to 3, the system comprising:
a diagnostic mode determination unit configured to acquire and determine a diagnostic strategy according to the brake pedal state signal and the vacuum pump enabling state signal; the diagnostic strategy includes not performing a diagnosis and performing a diagnosis;
an execution unit configured to execute the diagnostic policy; if the diagnosis is carried out, monitoring the first time consumed by the pressure in the current booster to rise from the first pressure value to the second pressure value and the second time consumed by the pressure in the current booster to fall from the second pressure value to the first pressure value in real time; determining a static leakage grade according to a comparison result of the first time and a preset value; determining the dynamic leakage grade according to the comparison result of the second time and a preset value; selecting one of the static leakage grade and the dynamic leakage grade with higher leakage grade as a system leakage grade;
wherein the determining the static leakage level according to the comparison result of the first time and the preset value comprises: when the first time is greater than a first preset value T1, the static leakage grade is 0; when the first time is greater than a second preset value T2 and less than or equal to a first preset value T1, the static leakage grade is 1; when the first time is greater than a third preset value T3 and less than or equal to a second preset value T2, the static leakage grade is 2;
the determining the dynamic leakage grade according to the comparison result of the second time and the preset value comprises the following steps: when the second time is less than or equal to a fifth preset value T5, the dynamic leakage grade is 0; when the second time is greater than a fifth preset value T5 and less than or equal to a sixth preset value T6, the dynamic leakage grade is 1; and when the second time is greater than a sixth preset value T6 and less than or equal to a seventh preset value T7, the dynamic leakage grade is 2.
7. The brake vacuum power system leak diagnostic system of claim 6, wherein the system comprises:
and the detection unit is used for performing self-detection on the vacuum boosting system when the vehicle is powered on, allowing leakage diagnosis if the self-detection result is normal, and not performing leakage diagnosis if the self-detection result is normal.
8. The brake vacuum power system leak diagnostic system of claim 6, comprising:
the leakage state signal generating unit is used for generating a system leakage state signal according to the system leakage grade;
and the leakage warning unit is used for controlling the fault code recording unit to record fault codes according to the system leakage state signal, carrying out fault indication by the vehicle-mounted indicating lamp, displaying fault information by the vehicle-mounted display and/or carrying out voice alarm by the vehicle-mounted alarm equipment.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program when executed by a processor implements the steps of the brake vacuum power system leak diagnostic method of any one of claims 1-5.
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| CN113771813A (en) * | 2021-09-14 | 2021-12-10 | 恒大新能源汽车投资控股集团有限公司 | Control method and device of vacuum brake boosting system applied to vehicle |
| CN115214587B (en) * | 2021-11-09 | 2023-09-01 | 广州汽车集团股份有限公司 | Control method and device for vehicle brake vacuum power-assisted system |
| CN114215664B (en) * | 2021-12-24 | 2023-04-14 | 安徽江淮汽车集团股份有限公司 | Method and system for diagnosing leakage of evaporation system for fuel vehicle |
| CN115111091B (en) * | 2022-04-27 | 2024-04-12 | 一汽奔腾轿车有限公司 | Fuel oil leakage diagnosis method for fuel oil vehicle evaporation system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104118420A (en) * | 2014-07-30 | 2014-10-29 | 重庆长安汽车股份有限公司 | Fault diagnosis method for blade electric vehicle vacuum assistance brake system |
| CN106696942A (en) * | 2017-01-24 | 2017-05-24 | 北京新能源汽车股份有限公司 | Fault detecting and processing method and device for braking assisting system |
| CN108953131A (en) * | 2018-07-11 | 2018-12-07 | 北汽福田汽车股份有限公司 | The method and apparatus for detecting electric vacuum pump system leak |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB448588A (en) * | 1934-06-19 | 1936-06-11 | Siemens Ag | Improvements in and relating to electrical brake pressure regulators for railway vehicles |
| JPH11124025A (en) * | 1997-10-24 | 1999-05-11 | Toyota Motor Corp | Method to estimate accumulator pressure of braking device |
| US6223130B1 (en) * | 1998-11-16 | 2001-04-24 | Deka Products Limited Partnership | Apparatus and method for detection of a leak in a membrane of a fluid flow control system |
| CN101332813B (en) * | 2008-08-06 | 2010-06-23 | 清华大学 | Vehicle brake efficacy monitoring and alarm system |
| CN103359100B (en) * | 2012-04-09 | 2015-09-30 | 广州汽车集团股份有限公司 | A kind of Automobile brake control system and control method |
| US20130280095A1 (en) * | 2012-04-20 | 2013-10-24 | General Electric Company | Method and system for reciprocating compressor starting |
| US9393946B2 (en) * | 2013-12-12 | 2016-07-19 | Continental Automotive Systems, Inc. | Detection of vacuum booster leak to atmosphere or booster checkball malfunction |
| US10046746B2 (en) * | 2014-07-02 | 2018-08-14 | Volvo Truck Corporation | Method for piloting a braking system of a vehicle, braking system and vehicle comprising such a braking system |
| CN105539409B (en) * | 2015-11-30 | 2018-07-17 | 北京新能源汽车股份有限公司 | The force aid system for braking of vehicle and vehicle with it |
| KR102406138B1 (en) * | 2016-03-09 | 2022-06-07 | 현대자동차주식회사 | Method for detecting vacuum pump fail of vehicle |
| CN105905092B (en) * | 2016-04-19 | 2018-10-09 | 北京长城华冠汽车科技股份有限公司 | A kind of electronic vacuum pump control method and device |
| CN106335490B (en) * | 2016-09-26 | 2019-08-30 | 北京新能源汽车股份有限公司 | Brake fluid leakage processing method, device and the pure electric automobile of pure electric automobile |
| JP6678611B2 (en) * | 2017-03-06 | 2020-04-08 | 日立オートモティブシステムズ株式会社 | Abnormality diagnosis device and abnormality diagnosis method for booster |
| CN107031457B (en) * | 2017-03-15 | 2020-11-27 | 北京长城华冠汽车科技股份有限公司 | Vacuum system fault detection method and system for electric automobile |
| CN107117155A (en) * | 2017-04-26 | 2017-09-01 | 北京新能源汽车股份有限公司 | Fault detection method, device and the automobile of the force aid system for braking of electric automobile |
| CN107176157A (en) * | 2017-05-19 | 2017-09-19 | 重庆凯瑞电动汽车系统有限公司 | Electric automobile vacuum braking gas leakage detection and emergency braking system |
-
2019
- 2019-11-08 CN CN201911089422.XA patent/CN112776789B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104118420A (en) * | 2014-07-30 | 2014-10-29 | 重庆长安汽车股份有限公司 | Fault diagnosis method for blade electric vehicle vacuum assistance brake system |
| CN106696942A (en) * | 2017-01-24 | 2017-05-24 | 北京新能源汽车股份有限公司 | Fault detecting and processing method and device for braking assisting system |
| CN108953131A (en) * | 2018-07-11 | 2018-12-07 | 北汽福田汽车股份有限公司 | The method and apparatus for detecting electric vacuum pump system leak |
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