CN113358373B - Off-line detection method and equipment for electric brake booster system - Google Patents
Off-line detection method and equipment for electric brake booster system Download PDFInfo
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- CN113358373B CN113358373B CN202110835774.6A CN202110835774A CN113358373B CN 113358373 B CN113358373 B CN 113358373B CN 202110835774 A CN202110835774 A CN 202110835774A CN 113358373 B CN113358373 B CN 113358373B
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- 238000003825 pressing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
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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
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/007—Malfunction diagnosis, i.e. diagnosing a sensor defect
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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
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Abstract
The invention discloses a method and equipment for detecting the off-line of an electric brake booster system, wherein the method comprises the following steps: pre-building pressure of an electric booster; performing pressure building detection through the electric booster to obtain a pressure building detection result; performing pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result; and determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result. According to the technical scheme, the performance of the electric power-assisted braking system is determined by pre-pressure building, pressure building detection and pressure maintaining detection of the electric power booster, and detection results are obtained, so that the electric power-assisted braking system can be used for comprehensively diagnosing the performance of the electric power-assisted braking system on a production line, and safety running of a vehicle is guaranteed.
Description
Technical Field
The invention belongs to the technical field of automobile braking, and particularly relates to a method and equipment for detecting the offline state of an electric brake booster system.
Background
At present, a pure electric vehicle with an electric power assisting system has no vacuum power assisting, and brake power assisting is completely from the electric brake power assisting system of the vehicle, so that the off-line detection of the electric brake power assisting system is significant for safe running of the vehicle.
Whether the electric brake booster system leaves the factory and can work stably and reliably depends on whether the working performance of the electric booster system is comprehensively detected when the electric booster system leaves the factory, for example: system leakage, pressure sensor failure, travel sensor anomalies, etc.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a method and apparatus for detecting the off-line of an electric brake booster system.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
an off-line detection method of an electric brake booster system, comprising:
pre-building pressure of an electric booster;
performing pressure building detection through the electric booster to obtain a pressure building detection result;
performing pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
and determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result.
Optionally, before the electric booster pre-builds pressure, the method includes:
zero marks of stroke sensors of the electric booster are zero;
and the zero position of the pressure sensor of the electric booster is marked with zero.
Optionally, the electric booster pre-builds pressure, including:
presetting a limiting stroke M of a pressure building piston and the number n of times of pressure building;
the motor of the electric booster performs n times of pre-pressure building;
the pressure building piston moves to the limiting stroke M.
Optionally, the step of performing the step-up detection by the electric booster to obtain a step-up detection result includes:
confirming the actual stroke of the piston;
performing leakage detection on the position corresponding to the actual stroke, and obtaining a detection result;
and obtaining a pressure building test result according to the detection result.
Optionally, performing leak detection on a position corresponding to the actual stroke, and obtaining a detection result, including:
acquiring the actual pressure of the position corresponding to the actual stroke;
comparing the actual pressure with the limiting pressure to obtain a first comparison result;
and acquiring a detection result based on the first comparison result.
Optionally, based on the first comparison result, obtaining a detection result includes:
comparing the actual travel with the limited travel to obtain a second comparison result;
based on the second comparison result, obtaining a duration for which the detected pressure is lower than the limit pressure;
comparing the duration time with the limiting time to obtain a third comparison result;
and acquiring a leakage judging result according to the third comparison result.
Optionally, the performing pressure maintaining detection by the electric booster, obtaining the pressure maintaining detection result includes:
presetting a pressure threshold value B;
acquiring the time t of the piston keeping the limit stroke;
obtaining a pressure drop value of the electric booster within a t range;
comparing the pressure drop value with B to obtain a fourth comparison result;
and acquiring the pressure maintaining detection result according to the fourth comparison result.
Optionally, the determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result includes:
if the pressure building detection result or the pressure maintaining detection result is fed back that the electric brake boosting system is abnormal, the electric brake boosting system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake boosting system is normal, the electric brake boosting system is normal.
The embodiment of the invention also provides an off-line detection device of the electric brake boosting system, which comprises the following steps of:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are connected with the electric booster;
the controller comprises an application chip and a driving chip connected with the application chip; the application chip is respectively connected with the pressure sensor and the stroke sensor;
and the data analysis device is connected with the application chip.
Optionally, the data analysis device comprises a data acquisition and calibration tool, and the data acquisition and calibration tool is connected with the application chip.
The embodiment of the invention has the following technical effects:
according to the technical scheme, the performance of the electric power-assisted braking system is determined by pre-pressure building, pressure building detection and pressure maintaining detection of the electric power booster, and detection results are obtained, so that the electric power-assisted braking system can be used for comprehensively diagnosing the performance of the electric power-assisted braking system on a production line, and safety running of a vehicle is guaranteed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the offline of an electric brake booster system according to an embodiment of the present invention;
fig. 2 is a block diagram of a method for detecting the offline state of the electric brake booster system according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The PV curve referred to in the present invention: v=f (P), where P is power and V is voltage, and when the voltage is stable, a power limit value and a voltage threshold value for system voltage stability can be obtained; OBD (On Board Diagnostics) on-board diagnostic system.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting an offline state of an electric brake booster system, including:
step S1: pre-building pressure of an electric booster;
specifically, when the power-on cycle is repeated, the test can be repeated, and the pre-pressure building is not performed when the test is repeated, so that the accuracy of the detection result is improved.
Step S2: performing pressure building detection through the electric booster to obtain a pressure building detection result;
step S3: performing pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
step S4: and determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result.
According to the embodiment of the invention, the performance of the electric power-assisted braking system is determined by pre-pressure building, pressure building detection and pressure maintaining detection of the electric power booster, and the detection result is obtained, so that the electric power-assisted braking system can be used for comprehensively diagnosing the performance of the electric power-assisted braking system on a production line, and the safety running of a vehicle is guaranteed.
In an optional embodiment of the present invention, in step S1, before the pre-pressing of the electric booster, the method includes:
step S11: zero marks of stroke sensors of the electric booster are zero;
specifically, the application chip sends a zero marking instruction to the travel sensor, and the travel sensor is controlled to carry out zero marking.
Step S12: and the zero position of the pressure sensor of the electric booster is marked with zero.
Specifically, the zero marking instruction is sent to the pressure sensor through the application chip, and the pressure sensor is controlled to carry out zero marking.
In this embodiment of the present invention, zero calibration is performed on both the stroke sensor and the pressure sensor before the off-line detection in order to improve the accuracy of the stroke sensor and the pressure sensor.
In an optional embodiment of the present invention, in step S1, the pre-pressing of the electric booster includes:
step S13: presetting a limiting stroke M of a pressure building piston and the number n of times of pressure building;
step S14: the motor of the electric booster performs n times of pre-pressure building;
specifically, the application chip sends a command for driving the piston to move to the driving chip through the bus, and the driving chip drives a motor of the electric booster according to the command to perform pre-pressing n times at the same forward speed A mm/s automatically; wherein n can be set according to actual needs;
step S15: the pressure building piston moves to the limiting stroke M.
In this embodiment of the invention, the electric booster is pre-pressurized n times in order to accurately determine the limiting stroke, i.e. the maximum stroke, of the piston.
In an optional embodiment of the present invention, in step S2, the step of performing the voltage build-up detection by the electric booster to obtain a voltage build-up detection result includes:
step S21: confirming the actual stroke of the piston;
specifically, the stroke sensor acquires an actual stroke of the piston, and transmits the acquired actual stroke to the application chip.
Step S22: performing leakage detection on the position corresponding to the actual stroke, and obtaining a detection result;
step S23: and obtaining a pressure building test result according to the detection result.
In this embodiment of the invention, a detection position is selected, the detection position being less than the limit stroke.
In an optional embodiment of the present invention, in step S22, performing leak detection on a position corresponding to the actual stroke, and obtaining a detection result includes:
step S221: acquiring the actual pressure of the position corresponding to the actual stroke;
specifically, the actual pressure of the position corresponding to the actual stroke is obtained through the pressure sensor, and the obtained value of the actual pressure is sent to the application chip.
Step S222: comparing the actual pressure with the limiting pressure to obtain a first comparison result;
specifically, the application chip compares the actual pressure with the limiting pressure to obtain a first comparison result, and the obtained first comparison result is sent to the data analysis device through the data acquisition and calibration tool.
Step S223: and acquiring a detection result based on the first comparison result.
In this embodiment of the present invention, the actual pressure is compared with the lower limit value of the set curve to determine whether the acquisition duration cnt based on the actual pressure can be obtained.
In an optional embodiment of the present invention, in step S222, based on the first comparison result, obtaining a detection result includes:
step S2221: comparing the actual travel with the limited travel to obtain a second comparison result;
specifically, the application chip compares the actual travel with the limited travel, obtains a second comparison result, and sends the second comparison result to the data analysis device through the data acquisition and calibration tool.
Step S2222: based on the second comparison result, obtaining a duration for which the detected pressure is lower than the limit pressure;
step S2223: comparing the duration time with the limiting time to obtain a third comparison result;
step S2224: and acquiring a leakage judging result according to the third comparison result.
In the embodiment of the invention, the actual pressure lower than the limiting pressure is used as effective reference data of a detection result, the time of the actual pressure lower than the limiting pressure is accumulated, and when the duration time obtained by accumulation is more than or equal to the limiting time T, the fault of 'off-line detection abnormality' is reported; when the duration time obtained by accumulation is smaller than the limit time, the fault is recovered, and the accurate reporting of the abnormal event is realized.
In an optional embodiment of the present invention, in step S3, the performing pressure maintaining detection by the electric booster to obtain the pressure maintaining detection result includes:
step S31: presetting a pressure threshold value B;
step S32: acquiring the time t of the piston keeping the limit stroke;
specifically, the driving chip is controlled by the application chip to drive the piston to run to the limit stroke, and the application chip is used for acquiring the time t for which the piston is kept at the limit stroke position.
Step S33: obtaining a pressure drop value of the electric booster within a t range;
specifically, the pressure drop value in the t range obtained by the pressure sensor is collected by the application chip.
Step S34: comparing the pressure drop value with B to obtain a fourth comparison result;
specifically, the application chip compares the pressure drop value with the pressure drop value B to obtain a fourth comparison result, and the fourth comparison result is sent to the data analysis device through the data acquisition and calibration tool.
Step S35: and acquiring the pressure maintaining detection result according to the fourth comparison result.
In this embodiment of the present invention, if the pressure drop between the time of holding the piston at the maximum stroke of t and the time of holding the piston at the 2 nd to t is greater than the pressure threshold value B, the feedback electric brake boosting system is abnormal.
In an optional embodiment of the present invention, in step S4, determining the working state of the electric brake booster system according to the pressure build-up detection result or the pressure maintaining detection result includes:
step S41: if the pressure building detection result or the pressure maintaining detection result is fed back that the electric brake boosting system is abnormal, the electric brake boosting system is abnormal;
step S42: and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake boosting system is normal, the electric brake boosting system is normal.
Specifically, after the pressure maintaining test is finished, the application chip controls the driving chip to drive the motor to return at the return speed of C mm/s, if the pressure building process or the pressure maintaining process result is abnormal, the feedback pressure building test fails, otherwise, the feedback is successful.
After the electric booster is detected, if the detection result is that the electric brake booster system is normal, otherwise, the electric brake booster system is normally checked, specific reasons are determined, for example, whether air exists in the brake system after the electric brake booster system is vacuumized and filled, and the brake system is blocked, system leakage, pressure sensor faults, travel sensor anomalies and the like.
According to the embodiment of the invention, the actual working state of the electric brake booster system is judged by combining the working states of the electric brake booster system fed back by the pressure building detection and the pressure maintaining detection, so that the comprehensive diagnosis of the performance of the electric brake booster system is realized.
With reference to fig. 2, specifically, the above embodiment of the present invention may be implemented by the following implementation manner:
triggering the off-line piston of the whole vehicle to build pressure through an application chip;
determining whether the actual stroke of the piston is greater than or equal to N through a stroke sensor, wherein N is smaller than a limit stroke M; if yes, executing the next step, otherwise, returning to the step 1);
off-line leakage detection of the whole vehicle: judging whether the actual pressure corresponding to the actual stroke is smaller than the set lower limit value of the PV curve or not through the application chip and the pressure sensor, if yes, cnt=cnt+1; if not, cnt=cnt-1; wherein cnt is the time when the actual pressure is less than the set lower limit value of the PV curve;
judging whether the actual stroke is greater than or equal to M through a stroke sensor; if yes, executing the next step, otherwise, returning to the step 3);
judging whether the cnt is larger than or equal to T through the application chip, if so, feeding back the off-line detection abnormality of the whole vehicle, and ending the detection flow; otherwise, executing the next step;
and (3) pressure maintaining detection: and judging whether the pressure drop value is larger than the pressure threshold value B by the application chip, if so, feeding back the abnormal detection of the whole vehicle off-line, and ending the detection flow, otherwise, feeding back the normal detection of the whole vehicle off-line, and ending the detection flow.
The embodiment of the invention also provides a device for detecting the off-line of the electric brake booster system, which comprises the following components:
the pre-pressure building module is used for pre-building pressure of the electric booster;
the voltage building detection module is used for carrying out voltage building detection through the electric booster to obtain a voltage building detection result;
the pressure maintaining detection module is used for carrying out pressure maintaining detection through the electric booster to obtain the pressure maintaining detection result;
and the determining module is used for determining the working state of the electric brake boosting system according to the pressure building detection result or the pressure maintaining detection result.
Optionally, before the electric booster pre-builds pressure, the method includes:
zero marks of stroke sensors of the electric booster are zero;
and the zero position of the pressure sensor of the electric booster is marked with zero.
Optionally, the electric booster pre-builds pressure, including:
presetting a limiting stroke M of a pressure building piston and the number n of times of pressure building;
the motor of the electric booster performs n times of pre-pressure building;
the pressure building piston moves to the limiting stroke M.
Optionally, the step of performing the step-up detection by the electric booster to obtain a step-up detection result includes:
confirming the actual stroke of the piston;
performing leakage detection on the position corresponding to the actual stroke, and obtaining a detection result;
and obtaining a pressure building test result according to the detection result.
Optionally, performing leak detection on a position corresponding to the actual stroke, and obtaining a detection result, including:
acquiring the actual pressure of the position corresponding to the actual stroke;
comparing the actual pressure with the limiting pressure to obtain a first comparison result;
and acquiring a detection result based on the first comparison result.
Optionally, based on the first comparison result, obtaining a detection result includes:
comparing the actual travel with the limited travel to obtain a second comparison result;
based on the second comparison result, obtaining a duration for which the detected pressure is lower than the limit pressure;
comparing the duration time with the limiting time to obtain a third comparison result;
and acquiring a leakage judging result according to the third comparison result.
Optionally, the performing pressure maintaining detection by the electric booster, obtaining the pressure maintaining detection result includes:
presetting a pressure threshold value B;
acquiring the time t of the piston keeping the limit stroke;
obtaining a pressure drop value of the electric booster within a t range;
comparing the pressure drop value with B to obtain a fourth comparison result;
and acquiring the pressure maintaining detection result according to the fourth comparison result.
Optionally, the determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result includes:
if the pressure building detection result or the pressure maintaining detection result is fed back that the electric brake boosting system is abnormal, the electric brake boosting system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake boosting system is normal, the electric brake boosting system is normal.
The embodiment of the invention also provides an off-line detection device of the electric brake boosting system, which comprises the following steps of:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are connected with the electric booster;
the controller comprises an application chip and a driving chip connected with the application chip; the application chip is respectively connected with the pressure sensor and the stroke sensor;
specifically, the application chip is connected with the driving chip through a bus.
And the data analysis device is connected with the application chip.
Specifically, the data analysis device further comprises an electric detection device, the electric detection device is connected with the OBD interface of the vehicle, and after the whole vehicle bar code information is scanned, the electric detection device starts to detect.
According to the embodiment of the invention, the actual data value detected by the application chip is compared with the limit value, the comparison result is sent to the data analysis device, the data analysis device analyzes the received comparison result, whether the electric brake booster system is abnormal or not is obtained, and if the electric brake booster system is abnormal, the reason of the abnormality is found.
In an optional embodiment of the present invention, the data analysis device includes a data acquisition and calibration tool, and the data acquisition unit and the data calibration unit are respectively connected with the application chip.
Specifically, the data acquisition and calibration tool is also connected with the electric inspection device, and the data acquisition and calibration tool is used for sending the received data of the electric inspection device and the application chip to the data analysis device.
In addition, other structures and functions of the apparatus according to the embodiments of the present invention are known to those skilled in the art, and are not described herein for redundancy reduction.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (7)
1. The method for detecting the off-line of the electric brake boosting system is characterized by comprising the following steps of:
pre-building pressure of an electric booster;
performing pressure building detection through the electric booster to obtain a pressure building detection result;
performing pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
determining the working state of the electric brake booster system according to the pressure building detection result or the pressure maintaining detection result;
the electric booster is used for detecting the pressure build-up, obtaining a pressure build-up detection result, including:
confirming the actual stroke of the piston;
performing leakage detection on the position corresponding to the actual stroke, and obtaining a detection result;
obtaining a pressure building test result according to the detection result;
performing leakage detection on the position corresponding to the actual stroke, and obtaining a detection result, wherein the detection method comprises the following steps:
acquiring the actual pressure of the position corresponding to the actual stroke;
comparing the actual pressure with the limiting pressure to obtain a first comparison result;
acquiring a detection result based on the first comparison result;
based on the first comparison result, obtaining a detection result includes:
comparing the actual travel with the limited travel to obtain a second comparison result;
based on the second comparison result, obtaining a duration for which the detected pressure is lower than the limit pressure;
comparing the duration time with the limiting time to obtain a third comparison result;
and acquiring a leakage judging result according to the third comparison result.
2. The method of claim 1, wherein prior to pre-pressing the electric booster, comprising:
zero marks of stroke sensors of the electric booster are zero;
and the zero position of the pressure sensor of the electric booster is marked with zero.
3. The method of claim 1, wherein the electric booster pre-builds pressure, comprising:
presetting a limiting stroke M of a pressure building piston and the number n of times of pressure building;
the motor of the electric booster performs n times of pre-pressure building;
the pressure-build piston moves to the limit stroke M.
4. The method according to claim 1, wherein the performing the dwell detection by the electric booster to obtain the dwell detection result includes:
presetting a pressure threshold value B;
acquiring the time t of the piston keeping the limit stroke;
obtaining a pressure drop value of the electric booster within a t range;
comparing the pressure drop value with B to obtain a fourth comparison result;
and acquiring the pressure maintaining detection result according to the fourth comparison result.
5. The method according to claim 1, wherein determining the operation state of the electric brake assist system according to the pressure build-up detection result or the pressure maintaining detection result includes:
if the pressure building detection result or the pressure maintaining detection result is fed back that the electric brake boosting system is abnormal, the electric brake boosting system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake boosting system is normal, the electric brake boosting system is normal.
6. An off-line detection apparatus of an electric brake assist system, characterized by applying the method according to any one of claims 1 to 5, comprising:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are connected with the electric booster;
the controller comprises an application chip and a driving chip connected with the application chip; the application chip is respectively connected with the pressure sensor and the stroke sensor;
and the data analysis device is connected with the application chip.
7. The apparatus of claim 6, wherein the data analysis device comprises a data acquisition and calibration tool, the data acquisition and calibration tool being coupled to the application chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110835774.6A CN113358373B (en) | 2021-07-23 | 2021-07-23 | Off-line detection method and equipment for electric brake booster system |
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