CN114278690B - Brake wear monitoring device, method, computer equipment and storage medium - Google Patents
Brake wear monitoring device, method, computer equipment and storage medium Download PDFInfo
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- CN114278690B CN114278690B CN202111624675.XA CN202111624675A CN114278690B CN 114278690 B CN114278690 B CN 114278690B CN 202111624675 A CN202111624675 A CN 202111624675A CN 114278690 B CN114278690 B CN 114278690B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012806 monitoring device Methods 0.000 title claims description 5
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 238000005299 abrasion Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 230000033001 locomotion Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
Abstract
The invention discloses a device, a method, computer equipment and a storage medium for monitoring the abrasion of a brake, wherein when the brake brakes, a motor drives a caliper to move towards a brake disc, a brake pad on the caliper is jointed with the brake disc to generate relative friction so as to realize the braking, and the method for monitoring the abrasion of the brake comprises the following steps: when the brake brakes for the Nth time, recording a motor angle A1 when a motor angle curve reaches the top point; when the brake is braked for the n+1th time, recording a motor angle A2 when the motor angle curve reaches the peak; the wear amount Δw=Δa×the gear ratio R of the transmission unit, Δa=a2-A1 of the n+1th brake. The invention can completely monitor the total wear and tear quantity of the brake pad, and can accurately monitor the total wear and tear quantity so as to replace the brake pad in time when the total wear and tear quantity exceeds a threshold value and ensure the driving safety.
Description
[ field of technology ]
The invention belongs to the technical field of automobile parts, and particularly relates to a brake.
[ background Art ]
Chinese patent publication No. CN106132794a, entitled electric brake and electric brake system: the torque estimation means estimates the motor torque by using the position where the absolute value of the motor torque increases as a reference position (the motor rotation angle is "0"), and advances from the reference position movement unit 14 toward the brake disc 5 to a position where the friction pad 6 contacts the brake disc 5, and detects the motor rotation angle. The contact position is determined from the estimated braking force value. The relationship between the motor voltage and the motor rotation angle is determined, and the restraining force is estimated. The pad wear amount estimating means recognizes whether the moving portion 14 reaches the retreating end based on the estimated restraining force. The contact position is detected by using the load sensor 13 or by pressing the brake disc with a friction pad, which causes a reduction in the number of motor revolutions. Applying a voltage to the motor to retract the moving part 14; the pad wear detection means calculates the motor angular velocity ω using the rotation angle. The angular velocity ω is compared with the threshold value α to determine whether the moving portion 14 reaches the retreating end. The position at which the moving part 14 reaches the retreating end is recorded as a reference position θmin. Applying a motor voltage for advancing the moving part 14; the pad wear detecting means determines whether or not the load sensor 13 output F is a threshold F0, and determines that the contact position θ0 of the friction pad 6 is; and (theta 0-theta min) estimating the pad wear.
The prior art indirectly estimates the abrasion loss of the pad, and the error is larger.
[ invention ]
In order to overcome the defects in the prior art, the technical problem to be solved by the invention is to provide a brake wear monitoring method which can accurately monitor the wear amount.
In order to solve the technical problems, the invention adopts the following technical scheme:
the method for monitoring the abrasion of the brake comprises the following steps that when the brake is braked, a motor drives a caliper to enable the caliper to move towards a brake disc, and a brake pad on the caliper is engaged with the brake disc to generate relative friction to realize braking, and the method for monitoring the abrasion of the brake comprises the following steps:
when the brake brakes for the Nth time, recording a motor angle A1 when a motor angle curve reaches the top point;
when the brake is braked for the n+1th time, recording a motor angle A2 when the motor angle curve reaches the peak;
the wear amount Δw=Δa×the gear ratio R of the transmission unit, Δa=a2-A1 of the n+1th brake.
Preferably, the abrasion loss of the brake during each braking is accumulated, and the total abrasion loss delta W of the brake after N+X times of braking is calculated n 。
Preferably, when the brake is braked for the n+3 times, the motor angle A3 when the motor angle curve reaches the peak is recorded, the wear amount accumulated value of the brake for the n+2 times and the brake for the n+3 times is delta W ', delta A' =delta A+ (A3-A2), delta W '=delta A' ×R, and the like, and the total wear amount delta W after the brake is braked for the n+X times is calculated n 。
Preferably, when DeltaW n And when the threshold value is exceeded, the brake pad is warned to be replaced.
Preferably, deltaW n Storing after each update, and calling out the delta W after the system is powered down and powered up again n The values continue to accumulate and iterate.
Preferably, after the braking instruction is eliminated, the motor rotates reversely to drive the brake pad to leave the brake disc, the clutch is separated from the motor, the retreating position is a fixed angle reversed from the position A2, and the clutch is separated from the motor, so that the separation distance between the brake pad and the brake disc is kept consistent.
In another aspect, a brake wear monitoring device is provided, and the brake wear monitoring method is used for monitoring brake wear, and includes:
the motor angle curve monitoring module is used for monitoring a motor angle curve when the brake brakes and recording a motor angle A1 when the motor angle curve reaches the top point when the brake brakes for the N-th time and a motor angle A2 when the motor angle curve reaches the top point when the brake brakes for the (n+1) -th time;
the single brake wear amount calculating module is used for calculating the wear amount delta W of the (n+1) th brake of the brake, wherein delta W=delta A×the transmission ratio R of the transmission unit, and delta A=A2-A1;
the brake total wear amount calculation module is used for calculating the total wear amount delta W of the brake after N+X times of braking n 。
Furthermore, the invention also provides a computer device and a computer readable storage medium.
A computer device comprising at least one processor and memory; the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored in the memory, causing the at least one processor to perform the brake wear monitoring method.
A computer readable storage medium having stored therein computer executable instructions that when executed by a processor implement the brake wear monitoring method.
The invention adopts the technical scheme and has the following beneficial effects:
the invention calculates the abrasion loss of the brake when braking each time, can completely monitor the total abrasion loss of the brake pad in an accumulated mode, and can realize accurate monitoring so as to be convenient for replacing the brake pad in time when the total abrasion loss exceeds a threshold value and ensure the driving safety.
These features and advantages of the invention will be disclosed in more detail in the following detailed description and accompanying drawings.
[ description of the drawings ]
The invention is further described with reference to the accompanying drawings:
fig. 1 is a schematic structural view of an electric brake device according to the present invention;
FIG. 2 is a graph of motor angle, current, torque in accordance with the present invention;
reference numerals: the motor 20, the transmission unit 30, the clutch 31, the gear assembly 32, the lead screw nut assembly 33, the caliper 40, the brake disc 41 and the brake pad 42.
[ detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
Referring to fig. 1, a brake, i.e., an electric brake device, is provided on a wheel to perform braking demand of an automobile. The electric brake device comprises an electric motor 20, a transmission unit 30, a caliper 40, a brake disc 41. The motor 20 is driven by a power supply to generate rotary motion; the transmission unit 30 performs rotational coupling, conversion of motion mode, and speed change, and generally includes a clutch 31 coupled with a motor, a gear assembly 32 performing speed reduction, a screw nut assembly 33 converting rotational motion into a straight line and performing speed change; transmitting the movement to the caliper 40 through the transmission unit, pushing the caliper 40 to move toward the brake disc 41; the brake disc 41 is fixed to the wheel, and the brake pads 42 on the caliper generate relative friction when engaged with the brake disc 41, and after passing the engagement point (kisjoint), the caliper clamps the brake disc to effect braking.
The invention aims to provide a method for timely monitoring and compensating the abrasion loss.
Referring to the prior art, an angle sensor, a rotation speed sensor and a current sensor are arranged on the motor, and the angle, the torque and the current of the motor are detected, and the graph of the angle, the current and the torque of the motor shown in fig. 2 is referred to.
The brake wear monitoring method comprises the following steps:
when the brake brakes for the Nth time, recording a motor angle A1 when a motor angle curve reaches the top point;
when the brake is braked for the n+1th time, recording a motor angle A2 when the motor angle curve reaches the peak;
the wear amount Δw=Δa×the gear ratio R of the transmission unit, Δa=a2-A1 of the n+1th brake.
Where Δw is in mm, assuming that the transmission unit includes 1 pair of gears, 1 pair of lead screw nuts, the transmission ratio= (motor angle x driving gear diameter D/driven gear diameter D) ×nut pitch x lead screw friction coefficient, where the units of diameter and pitch are mm.
It will be appreciated that N.gtoreq.1, typically 1, may be used to record and calculate the amount of wear from the start of the brake application.
The abrasion loss of each brake is calculated and recorded, and the abrasion loss of each brake is accumulated on the basis, so that the total abrasion loss delta W of the brake after N+X times of braking is calculated n 。
It will be appreciated that the total wear amount ΔW may be calculated directly after the number of braking operations reaches the set number without calculating the wear amount for each braking operation n Of course, the motor angle at which the motor angle curve reaches the apex still needs to be recorded at each braking. For example, when the brake is braked n+3 times, the motor angle A3 when the motor angle curve reaches the peak is recorded, the wear amount accumulated value of the brake n+2 times and the brake n+3 times is Δw ', Δa' =Δa+ (A3-A2), Δw '=Δa' ×r, and so on, and the total wear amount Δw after the brake n+x times is calculated n 。
According to the method, the specific steps are as follows:
1. and when the braking instruction is not received, the motor does not act, and the process is shown in the curve of the area I as shown in figure 2.
2. The motor receives a braking instruction to work, the brake pad moves towards the brake disc through transmission, when the brake pad and the brake disc enter a jointing stage, the load of the motor rises, the angle of the motor increases, the process is seen in a curve of a II area, and at the moment, the motor is controlled: the current of the motor is increased in coordination with the rising of the load so as to improve the torque of the motor and realize braking, and the torque value of the motor fluctuates as shown in the figure.
3. The motor angle curve does not increase until reaching the vertex, the motor torque value rises to be higher than step 2 after passing through the vertex, the motor angle A1 of the vertex is recorded, and the vertex is judged to reach the joint point. The motor speed drops sharply at this stage.
4. The braking instruction is eliminated, the motor enters a withdrawal stage, the motor receives current which rotates reversely, the brake pad is driven to leave the brake disc, and the clutch is disconnected with the motor to be in a curve state of a III region.
The steps 1 and 2 are repeated to generate corresponding curves IV and V, the vertex A2 is recorded, the delta A=A2-A1 is calculated, the abrasion loss delta W=delta A×the transmission ratio R of the transmission unit can be recorded, and the abrasion loss can be used for accumulation of the subsequent steps and can also be recalculated and recorded in the step 6.
And 3, repeating the step 3, wherein the retreating position is a fixed angle reversed from the position A2 of the vertex, and then the clutch is disconnected from the motor, so that the disconnection distance between the brake pad and the brake disc is kept consistent. This reversal fixed angle may be set for about 2 weeks.
5. Steps 1, 2 are repeated, the next vertex A3-A2 value is added to a new Δa, noted Δa ', Δa' =Δa+ (A3-A2), and a new Δw '=Δa' ×r is recorded.
In the driving cycle, the maximum value of the wear amount is recorded. After the system is powered down, the abrasion loss is required to be stored, and after the next power-up, the abrasion loss is called out, and the abrasion loss is continuously accumulated, so that the iteration is performed.
Step 5 is repeated, and when the delta P exceeds a threshold value, for example 35-40mm, the brake pad is warned to be replaced.
In summary, in the present embodiment, the total wear of the brake pad can be monitored completely by means of accumulation.
And (3) replacing the brake pad, wherein when the vehicle returns to the factory to replace the brake pad, the stored abrasion loss information is not correct. After the brake pad is replaced, a diagnosis instruction is sent to the vehicle, so that the motor drives the calipers to be fully opened. Whether the motor is completely opened or not can be known by detecting signals such as current, angular speed and the like, and the angular speed can be increased to judge when the motor receives reverse current. And then the motor is driven to travel to a joint point, and the calculated value of the distance that the motor pushes the caliper to travel after the caliper is completely opened is the current thickness of the brake disc and the thickness of the current brake pad, wherein the distance that the motor pushes the caliper to travel = the change of the motor rotation angle x the transmission ratio R of the transmission unit. The calculated value minus the thickness of the current brake disc and the current brake pad is the current abrasion loss, and the abrasion loss is stored, so that the strategy of changing the brake disc is completed.
Example two
The brake wear monitoring device, which monitors brake wear by adopting the brake wear monitoring method according to the first embodiment, comprises:
the motor angle curve monitoring module is used for monitoring a motor angle curve when the brake brakes and recording a motor angle A1 when the motor angle curve reaches the top point when the brake brakes for the N-th time and a motor angle A2 when the motor angle curve reaches the top point when the brake brakes for the (n+1) -th time;
the single brake wear amount calculating module is used for calculating the wear amount delta W of the (n+1) th brake of the brake, wherein delta W=delta A×the transmission ratio R of the transmission unit, and delta A=A2-A1;
the brake total wear amount calculation module is used for calculating the total wear amount delta W of the brake after N+X times of braking n 。
Example III
A computer device mountable on a vehicle having a brake, comprising at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes the computer-executable instructions stored in the memory, causing the at least one processor to perform the brake wear monitoring method as described in embodiment one.
Example IV
A computer readable storage medium, which can be mounted on the computer device according to the third embodiment, wherein the computer readable storage medium stores computer execution instructions, and when the processor executes the computer execution instructions, the brake wear monitoring method according to the first embodiment is implemented.
While the invention has been described in terms of specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but includes, but is not limited to, the drawings and the description of the specific embodiments. Any modifications which do not depart from the functional and structural principles of the invention are intended to be included within the scope of the appended claims.
Claims (8)
1. The method for monitoring the abrasion of the brake is characterized in that the motor drives the calipers to enable the calipers to move towards the brake disc when the brake brakes, and the brake pads on the calipers are engaged with the brake disc to generate relative friction to realize braking, and the method for monitoring the abrasion of the brake is characterized by comprising the following steps of:
when the brake brakes for the Nth time, recording a motor angle A1 when a motor angle curve reaches the top point;
when the brake is braked for the n+1th time, recording a motor angle A2 when the motor angle curve reaches the peak;
the wear amount Δw=Δa×the gear ratio R of the gear unit, Δa=a2-A1 of the n+1th brake;
after the braking command is eliminated, the motor rotates in the opposite direction from the position A2 by a fixed angle, and then the clutch is disconnected from the motor.
2. The method for monitoring the wear of a brake according to claim 1, wherein the wear amount of the brake during each braking is accumulated, and the total wear amount Δw of the brake after n+x braking is calculated n 。
3. A brake wear monitoring method according to claim 1, wherein the motor angle A3 at which the motor angle curve reaches the apex is recorded at the (n+3) th braking of the brake,the accumulated wear values of the n+2th brake and the n+3rd brake of the brake are DeltaW ', deltaA' =DeltaA+ (A3-A2), deltaW '=DeltaA' ×R, and so on, and the total wear quantity DeltaW of the brake after n+X times of braking is calculated n 。
4. A brake wear monitoring method according to claim 2 or 3, characterized in that when Δw n And when the threshold value is exceeded, the brake pad is warned to be replaced.
5. The brake wear monitoring method of claim 4, wherein Δw n Storing after each update, and calling out the delta W after the system is powered down and powered up again n The values continue to accumulate and iterate.
6. Brake wear monitoring device for monitoring brake wear by the brake wear monitoring method according to any one of claims 1 to 5, comprising:
the motor angle curve monitoring module is used for monitoring a motor angle curve when the brake brakes and recording a motor angle A1 when the motor angle curve reaches the top point when the brake brakes for the N-th time and a motor angle A2 when the motor angle curve reaches the top point when the brake brakes for the (n+1) -th time;
the single brake wear amount calculating module is used for calculating the wear amount delta W of the (n+1) th brake of the brake, wherein delta W=delta A×the transmission ratio R of the transmission unit, and delta A=A2-A1;
the brake total wear amount calculation module is used for calculating the total wear amount delta W of the brake after N+X times of braking n 。
7. A computer device comprising at least one processor and memory; the memory stores computer-executable instructions; the at least one processor executing computer-executable instructions stored in the memory causes the at least one processor to perform the brake wear monitoring method of any one of claims 1 to 5.
8. A computer readable storage medium having stored therein computer executable instructions which, when executed by a processor, implement the brake wear monitoring method of any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111624675.XA CN114278690B (en) | 2021-12-28 | 2021-12-28 | Brake wear monitoring device, method, computer equipment and storage medium |
| PCT/CN2022/142094 WO2023125452A1 (en) | 2021-12-28 | 2022-12-26 | Wear monitoring apparatus and method for brake, and computer device and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111624675.XA CN114278690B (en) | 2021-12-28 | 2021-12-28 | Brake wear monitoring device, method, computer equipment and storage medium |
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| Publication Number | Publication Date |
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| CN114278690A CN114278690A (en) | 2022-04-05 |
| CN114278690B true CN114278690B (en) | 2024-03-15 |
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| CN202111624675.XA Active CN114278690B (en) | 2021-12-28 | 2021-12-28 | Brake wear monitoring device, method, computer equipment and storage medium |
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| Country | Link |
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| CN (1) | CN114278690B (en) |
| WO (1) | WO2023125452A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278690B (en) * | 2021-12-28 | 2024-03-15 | 瀚德万安(上海)电控制动系统有限公司 | Brake wear monitoring device, method, computer equipment and storage medium |
| CN115009250B (en) * | 2022-06-29 | 2023-09-26 | 中车青岛四方车辆研究所有限公司 | Brake pad abrasion detection method and system for rail vehicle electromechanical brake system |
| CN117268799B (en) * | 2023-11-23 | 2024-03-08 | 靖江市黄埔机械部件制造有限公司 | Chassis brake detection method and system based on load torque |
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| JP2000234641A (en) * | 1999-02-15 | 2000-08-29 | Toyota Motor Corp | Motor-driven brake device |
| JP2015021508A (en) * | 2013-07-16 | 2015-02-02 | 三菱自動車工業株式会社 | Wear amount detection device |
| CN106132794A (en) * | 2014-03-24 | 2016-11-16 | Ntn株式会社 | Electrical braking device and electrical braking device system |
| CN109854648A (en) * | 2019-01-22 | 2019-06-07 | 绍兴驰达汽车配件制造有限公司 | A kind of monitoring worm screw rotational angle realizes the adjustment arm of brake pad wear alarm |
| CN110578764A (en) * | 2019-08-22 | 2019-12-17 | 上海大陆汽车制动系统销售有限公司 | Software type electronic brake caliper friction plate abrasion alarm system and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102006002307A1 (en) * | 2006-01-18 | 2007-07-19 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Method for indicating wear of at least one brake pad in a disc brake with electromotive actuator |
| JP6338907B2 (en) * | 2014-03-27 | 2018-06-06 | Ntn株式会社 | Electric brake device |
| DE102015117252A1 (en) * | 2015-10-09 | 2017-04-13 | Knorr-Bremse Systeme für Nutzfahrzeuge GmbH | Electric wear adjusting device of a disc brake, a corresponding disc brake and method for Lüftspielmessen, -Joint and wear measurement |
| JP6766539B2 (en) * | 2016-09-12 | 2020-10-14 | 株式会社アドヴィックス | Vehicle electric braking device |
| CN110762144B (en) * | 2018-07-25 | 2021-12-14 | 瀚德万安(上海)电控制动系统有限公司 | Disc brake and sensor device |
| CN114278690B (en) * | 2021-12-28 | 2024-03-15 | 瀚德万安(上海)电控制动系统有限公司 | Brake wear monitoring device, method, computer equipment and storage medium |
-
2021
- 2021-12-28 CN CN202111624675.XA patent/CN114278690B/en active Active
-
2022
- 2022-12-26 WO PCT/CN2022/142094 patent/WO2023125452A1/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000234641A (en) * | 1999-02-15 | 2000-08-29 | Toyota Motor Corp | Motor-driven brake device |
| JP2015021508A (en) * | 2013-07-16 | 2015-02-02 | 三菱自動車工業株式会社 | Wear amount detection device |
| CN106132794A (en) * | 2014-03-24 | 2016-11-16 | Ntn株式会社 | Electrical braking device and electrical braking device system |
| CN109854648A (en) * | 2019-01-22 | 2019-06-07 | 绍兴驰达汽车配件制造有限公司 | A kind of monitoring worm screw rotational angle realizes the adjustment arm of brake pad wear alarm |
| CN110578764A (en) * | 2019-08-22 | 2019-12-17 | 上海大陆汽车制动系统销售有限公司 | Software type electronic brake caliper friction plate abrasion alarm system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114278690A (en) | 2022-04-05 |
| WO2023125452A1 (en) | 2023-07-06 |
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