CN113358373A - Off-line detection method and device for electric brake power-assisted system - Google Patents
Off-line detection method and device for electric brake power-assisted system Download PDFInfo
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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
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Abstract
The invention discloses an offline detection method and equipment for an electric brake power-assisted system, wherein the method comprises the following steps: pre-building pressure of the electric booster; carrying out pressure build-up detection through the electric booster to obtain a pressure build-up detection result; carrying out pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result; and determining the working state of the electric brake power-assisted 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 acquiring the detection result through pre-pressure building, pressure building detection and pressure maintaining detection of the electric power booster, and the method can be used for comprehensively diagnosing the performance of the electric power-assisted braking system on a production line and is beneficial to guaranteeing the safe driving of a vehicle.
Description
Technical Field
The invention belongs to the technical field of automobile braking, and particularly relates to an offline detection method and device for an electric brake power-assisted system.
Background
At present, a pure electric vehicle carrying an electric power-assisted system does not have vacuum power assistance, and brake power assistance is completely from the electric brake power-assisted system of the vehicle, so offline detection of the electric brake power-assisted system has great significance for safe running of the vehicle.
Whether the electric brake power-assisted system can work stably and reliably when leaving factory depends on whether the working performance of the electric power-assisted system is comprehensively detected when the electric power-assisted system leaves factory, for example: system leaks, pressure sensor failures, travel sensor anomalies, etc.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide an offline detection method and apparatus for an electric brake boosting system.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
an offline detection method of an electric brake power assisting system comprises the following steps:
pre-building pressure of the electric booster;
carrying out pressure build-up detection through the electric booster to obtain a pressure build-up detection result;
carrying out pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
and determining the working state of the electric brake power-assisted system according to the pressure building detection result or the pressure maintaining detection result.
Optionally, before electric booster builds pressure in advance, include:
zero position marking of a stroke sensor of the electric booster is carried out;
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 limit stroke M of a pressure build-up piston and the number n of times of pre-pressure build-up;
the motor of the electric booster builds pressure for n times;
the pressure build-up piston travels to the limit stroke M.
Optionally, through electric booster builds pressure and detects, acquires and builds pressure testing result, include:
confirming the actual stroke of the piston;
carrying out leakage detection on the position corresponding to the actual stroke, and acquiring a detection result;
and acquiring a voltage building test result according to the detection result.
Optionally, the detecting the leakage of the position corresponding to the actual stroke and obtaining the detection result include:
acquiring actual pressure of a 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, obtaining a detection result based on the first comparison result includes:
comparing the actual stroke with the limit stroke to obtain a second comparison result;
acquiring a duration in which the detected pressure is lower than the limit pressure based on the second comparison result;
comparing the duration time with the limit time to obtain a third comparison result;
and acquiring a leakage judgment result according to the third comparison result.
Optionally, through electronic booster carries out the pressurize and detects, acquires the pressurize testing result, include:
presetting a pressure threshold value B;
acquiring the time t for keeping the limit stroke of the piston;
acquiring a pressure drop value of the electric booster within a range t;
comparing the voltage drop value with B to obtain a fourth comparison result;
and obtaining the pressure maintaining detection result according to the fourth comparison result.
Optionally, the determining the working state of the electric brake power-assisted 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 feeds back that the electric brake power-assisted system is abnormal, the electric brake power-assisted system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake power-assisted system is normal, the electric brake power-assisted system is normal.
Embodiments of the present invention also provide an offline detection device of an electric brake power assisting system, which applies the method as described above, and includes:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are both 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 travel sensor;
and the data analysis device is connected with the application chip.
Optionally, the data analysis device includes a data acquisition and calibration tool, and the data acquisition and calibration tool is connected to the application chip.
The embodiment of the invention has the following technical effects:
according to the technical scheme, the embodiment of the invention obtains the detection result through the pre-pressure building, the pressure building detection and the pressure maintaining detection of the electric booster to determine the performance of 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 is beneficial to guaranteeing the safe running of a vehicle.
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 an offline detection method of an electric brake power assisting system according to an embodiment of the present invention;
fig. 2 is a block diagram of an offline detection method of an electric brake power assisting system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As mentioned in the present invention, the PV curve: where P is power and V is voltage, where a system officer's stable power limit and voltage threshold may be obtained when voltage is stable; OBD (on Board diagnostics) vehicle-mounted diagnostic system.
As shown in fig. 1, an embodiment of the present invention provides an offline detection method for an electric brake assist system, including:
step S1: pre-building pressure of the electric booster;
specifically, when the secondary power-on cycle is repeatedly tested, the pre-voltage build-up is not performed any more during the repeated test, so that the accuracy of the detection result is improved.
Step S2: carrying out pressure build-up detection through the electric booster to obtain a pressure build-up detection result;
step S3: carrying out 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 power-assisted system according to the pressure building detection result or the pressure maintaining detection result.
According to the embodiment of the invention, the detection result is obtained through the pre-pressure building, the pressure building detection and the pressure maintaining detection of the electric booster to determine the performance of the electric power-assisted braking system, so that the method and the device can be used for comprehensively diagnosing the performance of the electric power-assisted braking system on a production line, and are beneficial to ensuring the safe driving of a vehicle.
In an alternative embodiment of the present invention, before the pre-boosting of the electric booster in step S1, the method includes:
step S11: zero position marking of a stroke sensor of the electric booster is carried out;
specifically, the zero-position zero-marking instruction is sent to the stroke sensor through the application chip, and the stroke sensor is controlled to perform zero-position zero-marking.
Step S12: and the zero position of the pressure sensor of the electric booster is marked with zero.
Specifically, the zero-position zero-marking instruction is sent to the pressure sensor through the application chip, and the pressure sensor is controlled to perform zero-position zero-marking.
In the embodiment of the invention, in order to improve the accuracy of the stroke sensor and the pressure sensor, zero-position zero-marking is performed on both the stroke sensor and the pressure sensor before offline detection is performed.
In an alternative embodiment of the present invention, in step S1, the pre-boosting of the electric booster includes:
step S13: presetting a limit stroke M of a pressure build-up piston and the number n of times of pre-pressure build-up;
step S14: the motor of the electric booster builds pressure for n times;
specifically, the application chip sends an instruction for driving the piston to move to the driving chip through a bus, and the driving chip drives a motor of the electric booster to automatically pre-build voltage for n times at the same trip speed A mm/s according to the instruction; wherein n can be set according to actual needs;
step S15: the pressure build-up piston travels to the limit stroke M.
In the embodiment of the invention, in order to accurately determine the limited stroke, namely the maximum stroke, of the piston, the electric booster is subjected to n-time pre-pressure building.
In an optional embodiment of the present invention, in step S2, the performing the voltage build-up detection by the electric booster to obtain the 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: carrying out leakage detection on the position corresponding to the actual stroke, and acquiring a detection result;
step S23: and acquiring a voltage building test result according to the detection result.
In the embodiment of the invention, the detection position is selected, and the detection position is smaller than the limited stroke.
In an optional embodiment of the present invention, in step S22, performing leakage detection on the position corresponding to the actual stroke, and acquiring a detection result, the method includes:
step S221: acquiring actual pressure of a position corresponding to the actual stroke;
specifically, the actual pressure at the position corresponding to the actual stroke is obtained through the pressure sensor, and the obtained actual pressure value 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 sends the obtained first comparison result 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.
This embodiment of the present invention compares the actual pressure with the lower limit value of the set curve to determine whether the acquisition duration cnt based on the actual pressure can be determined.
In an optional embodiment of the present invention, in step S222, obtaining a detection result based on the first comparison result includes:
step S2221: comparing the actual stroke with the limit stroke to obtain a second comparison result;
specifically, the application chip compares the actual stroke with the limited stroke to obtain a second comparison result, and sends the second comparison result to the data analysis device through the data acquisition and calibration tool.
Step S2222: acquiring a duration in which the detected pressure is lower than the limit pressure based on the second comparison result;
step S2223: comparing the duration time with the limit time to obtain a third comparison result;
step S2224: and acquiring a leakage judgment result according to the third comparison result.
According to the embodiment of the invention, the actual pressure lower than the limiting pressure is taken as the effective reference data of the 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 abnormal offline detection is reported; when the duration time obtained by accumulation is less 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 the dwell detection by the electric booster to obtain the dwell detection result includes:
step S31: presetting a pressure threshold value B;
step S32: acquiring the time t for keeping the limit stroke of the piston;
specifically, the driving chip is controlled by the application chip to drive the piston to run to the limit stroke, and the time t for keeping the piston at the limit stroke position is obtained by the application chip.
Step S33: acquiring a pressure drop value of the electric booster within a range t;
specifically, a pressure drop value in a range t acquired by the pressure sensor is acquired by the application chip.
Step S34: comparing the voltage drop value with B to obtain a fourth comparison result;
specifically, the application chip compares the voltage drop value with the voltage drop value B to obtain a fourth comparison result, and sends the fourth comparison result to the data analysis device through the data acquisition and calibration tool.
Step S35: and obtaining the pressure maintaining detection result according to the fourth comparison result.
In the embodiment of the invention, the time for keeping the piston at the maximum stroke is t, and if the pressure drop is greater than the pressure threshold value B during the kept time from 2 th to t, the feedback electric brake power-assisted system is abnormal.
In an alternative embodiment of the present invention, in step S4, the determining the working state of the electric brake boosting system according to the pressure build detection result or the pressure maintaining detection result includes:
step S41: if the pressure building detection result or the pressure maintaining detection result feeds back that the electric brake power-assisted system is abnormal, the electric brake power-assisted 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 power-assisted system is normal, the electric brake power-assisted system is normal.
Specifically, after the pressure maintaining test is finished, the driving chip is controlled by the application chip to drive the driving chip to return at the return speed of C mm/s, if the pressure building process or the pressure maintaining process result is abnormal, the pressure building test fails to be fed back, and otherwise, the pressure building test succeeds.
After the electric booster is detected, if the detection result shows that the electric brake boosting system is normal, otherwise, the electric brake boosting system is normally checked, and specific reasons are determined, such as whether air still exists in the brake system after the electric brake boosting system is vacuumized and filled, and the electric brake boosting system of the brake system is stuck, system leakage, pressure sensor failure, stroke sensor abnormality and the like.
According to the embodiment of the invention, the working state of the electric brake boosting system fed back by pressure build detection and pressure maintaining detection is combined to judge the actual working state of the electric brake boosting system, so that the comprehensive diagnosis of the performance of the electric brake boosting system is realized.
In conjunction with fig. 2, in particular, the above-described embodiment of the present invention can be implemented by the following implementation manners:
triggering the whole vehicle off-line piston 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);
and (3) finished automobile offline leakage detection: judging whether the actual pressure corresponding to the actual stroke is smaller than a set PV curve lower limit value or not by using the chip and the pressure sensor, if so, determining cnt as cnt + 1; if not, the cnt is equal to cnt-1; wherein cnt is the time when the actual pressure is less than the lower limit value of the set PV curve;
judging whether the actual stroke is more than or equal to M through a stroke sensor; if yes, executing the next step, otherwise, returning to the step 3);
judging whether cnt is greater 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 process; otherwise, executing the next step;
and (3) pressure maintaining detection: and judging whether the pressure drop value is larger than a pressure threshold value B or not through the application chip, if so, feeding back the abnormal offline detection of the whole vehicle and ending the detection process, otherwise, feeding back the normal offline detection of the whole vehicle and ending the detection process.
An embodiment of the present invention further provides an offline detection device for an electric brake power-assisted system, including:
the pre-pressure building module is used for building pressure in advance for the electric booster;
the pressure building detection module is used for carrying out pressure building detection through the electric booster to obtain a pressure building detection result;
the pressure maintaining detection module is used for performing pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
and the determining module is used for determining the working state of the electric brake power-assisted system according to the pressure building detection result or the pressure maintaining detection result.
Optionally, before electric booster builds pressure in advance, include:
zero position marking of a stroke sensor of the electric booster is carried out;
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 limit stroke M of a pressure build-up piston and the number n of times of pre-pressure build-up;
the motor of the electric booster builds pressure for n times;
the pressure build-up piston travels to the limit stroke M.
Optionally, through electric booster builds pressure and detects, acquires and builds pressure testing result, include:
confirming the actual stroke of the piston;
carrying out leakage detection on the position corresponding to the actual stroke, and acquiring a detection result;
and acquiring a voltage building test result according to the detection result.
Optionally, the detecting the leakage of the position corresponding to the actual stroke and obtaining the detection result include:
acquiring actual pressure of a 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, obtaining a detection result based on the first comparison result includes:
comparing the actual stroke with the limit stroke to obtain a second comparison result;
acquiring a duration in which the detected pressure is lower than the limit pressure based on the second comparison result;
comparing the duration time with the limit time to obtain a third comparison result;
and acquiring a leakage judgment result according to the third comparison result.
Optionally, through electronic booster carries out the pressurize and detects, acquires the pressurize testing result, include:
presetting a pressure threshold value B;
acquiring the time t for keeping the limit stroke of the piston;
acquiring a pressure drop value of the electric booster within a range t;
comparing the voltage drop value with B to obtain a fourth comparison result;
and obtaining the pressure maintaining detection result according to the fourth comparison result.
Optionally, the determining the working state of the electric brake power-assisted 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 feeds back that the electric brake power-assisted system is abnormal, the electric brake power-assisted system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake power-assisted system is normal, the electric brake power-assisted system is normal.
Embodiments of the present invention also provide an offline detection device of an electric brake power assisting system, which applies the method as described above, and includes:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are both 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 travel 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 an OBD interface of the vehicle, and after the bar code information of the whole vehicle 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 and obtains whether the electric brake power-assisted system is abnormal, and if the electric brake power-assisted system is abnormal, the reason of the abnormality is searched.
In an optional embodiment of the present invention, the data analysis apparatus includes a data acquisition and calibration tool, and the data acquisition unit and the data calibration unit are respectively connected to the application chip.
Specifically, the data acquisition and calibration tool is further connected with the electrical detection equipment, and the data acquisition and calibration tool is used for sending the received data of the electrical detection equipment and the application chip to the data analysis device.
In addition, other configurations and functions of the device according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail to reduce redundancy.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can 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). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An offline detection method of an electric brake power assist system, comprising:
pre-building pressure of the electric booster;
carrying out pressure build-up detection through the electric booster to obtain a pressure build-up detection result;
carrying out pressure maintaining detection through the electric booster to obtain a pressure maintaining detection result;
and determining the working state of the electric brake power-assisted system according to the pressure building detection result or the pressure maintaining detection result.
2. The method of claim 1, wherein the pre-boosting of the electric booster comprises:
zero position marking of a stroke sensor of the electric booster is carried out;
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 limit stroke M of a pressure build-up piston and the number n of times of pre-pressure build-up;
the motor of the electric booster builds pressure for n times;
the pressure build-up piston travels to the limit stroke M.
4. The method according to claim 1, wherein the performing the voltage build-up detection through the electric booster to obtain a voltage build-up detection result comprises:
confirming the actual stroke of the piston;
carrying out leakage detection on the position corresponding to the actual stroke, and acquiring a detection result;
and acquiring a voltage building test result according to the detection result.
5. The method of claim 4, wherein the detecting the leakage at the position corresponding to the actual stroke and obtaining the detection result comprises:
acquiring actual pressure of a 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.
6. The method of claim 5, wherein obtaining a detection result based on the first comparison result comprises:
comparing the actual stroke with the limit stroke to obtain a second comparison result;
acquiring a duration in which the detected pressure is lower than the limit pressure based on the second comparison result;
comparing the duration time with the limit time to obtain a third comparison result;
and acquiring a leakage judgment result according to the third comparison result.
7. The method of claim 4, wherein the performing the dwell detection by the electric booster to obtain the dwell detection result comprises:
presetting a pressure threshold value B;
acquiring the time t for keeping the limit stroke of the piston;
acquiring a pressure drop value of the electric booster within a range t;
comparing the voltage drop value with B to obtain a fourth comparison result;
and obtaining the pressure maintaining detection result according to the fourth comparison result.
8. The method according to claim 1, wherein determining the operating state of the electric brake boosting system according to the pressure build detection result or the pressure holding detection result comprises:
if the pressure building detection result or the pressure maintaining detection result feeds back that the electric brake power-assisted system is abnormal, the electric brake power-assisted system is abnormal;
and if the pressure building detection result and the pressure maintaining detection result both feed back that the electric brake power-assisted system is normal, the electric brake power-assisted system is normal.
9. An offline detection device of an electric brake power assist system, characterized in that the method according to any one of claims 1 to 8 is applied, comprising:
the sensor comprises a stroke sensor and a pressure sensor, and the stroke sensor and the pressure sensor are both 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 travel sensor;
and the data analysis device is connected with the application chip.
10. The apparatus of claim 9, wherein the data analysis device comprises a data acquisition and calibration tool, the data acquisition and calibration tool being connected to the application chip.
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