CN114705345A - Method for evaluating dragging force of brake caliper - Google Patents
Method for evaluating dragging force of brake caliper Download PDFInfo
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- CN114705345A CN114705345A CN202210461265.6A CN202210461265A CN114705345A CN 114705345 A CN114705345 A CN 114705345A CN 202210461265 A CN202210461265 A CN 202210461265A CN 114705345 A CN114705345 A CN 114705345A
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- brake caliper
- sliding distance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/28—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for testing brakes
- G01L5/284—Measuring braking-time or braking distance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a method for evaluating dragging force of a brake caliper, which comprises the following steps: step one, measuring the sliding distance from V to 0km/h of the speed of a test vehicle according to the GBT-12536 automobile sliding test method, and recording as SInitial(ii) a Step two, detaching the brake calipers of the test vehicle, then measuring again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as SDemolition work(ii) a Step three, calculating SDemolition workAnd SInitialIf the delta S is not larger than the design threshold, the dragging force of the brake caliper is satisfied, and if the delta S is larger than the design threshold, the dragging force of the brake caliper is not satisfied. The brake caliper is convenient to operate, can intuitively evaluate whether the brake caliper dragging force meets the requirement or not, and is short in verification period.
Description
Technical Field
The invention relates to a vehicle brake system performance test, in particular to a brake caliper drag force evaluation method.
Background
As a convenient transportation tool, the automobile is popular with consumers, and as the price of the automobile is lower, the automobile becomes one of indispensable tools for each family, but the automobile in the market needs to consume fuel oil, fuel oilThe automobile air conditioner is concerned by consumers as an important part of the use cost of automobiles, and at the same time, China pays attention to CO2The regulations for emission reduction are becoming more and more strict, so it is especially important to reduce the fuel consumption and carbon emission of automobiles.
The dragging force of the brake caliper is one of the running resistance of the vehicle, and the dragging refers to the friction torque of the brake caliper to a brake disc after the brake is over, so that how to quickly and accurately verify whether the dragging force of the brake caliper meets the requirement is an important part in vehicle performance verification. CN109186844A discloses a multifunctional caliper dragging force detection device and a use method thereof, wherein the current brake caliper dragging force test is carried out on a rack, the device limitation is carried out, and the measured brake dragging torque is different from the brake dragging torque under the real running state of a vehicle. CN111964830A discloses a dynamic test method for brake dragging torque, which simulates the matching state of a brake disc and a brake caliper in a real vehicle state through a driving device and a hydraulic device, so as to perform the test, and the test is complex in operation, cannot be converted into a visual evaluation index in a vehicle state, and is not beneficial to project management and control.
Disclosure of Invention
The invention aims to provide an evaluation method of brake caliper dragging force, which is convenient to operate, can intuitively evaluate whether the brake caliper dragging force meets the requirement or not, and has a short verification period.
The invention relates to a method for evaluating the dragging force of a brake caliper, which comprises the following steps:
step one, measuring the sliding distance from V to 0km/h of the speed of a test vehicle according to the GBT-12536 automobile sliding test method, and recording as SInitial；
Step two, detaching the brake calipers of the test vehicle, then measuring again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as SDemolition work；
Step three, calculating SDemolition workAnd SInitiation ofIf the delta S is not larger than the design threshold, the dragging force of the brake caliper is satisfied, and if the delta S is larger than the design threshold, the dragging force of the brake caliper is not satisfied.
Further, the preparation of the vehicle is carried out before the test vehicle is subjected to the sliding test, and the preparation method specifically comprises the following steps: and inspecting the test vehicle to ensure that the vehicle condition meets the requirement, and then preheating for running for 15-20 min under the condition that the vehicle speed is 60-80 km/h.
Further, the sliding distance measurement in the first step and the second step is specifically as follows: recording the sliding distance of the test vehicle from 40km/h, namely V sliding to complete stop, namely 0km/h, performing the test at least for six times, overlapping the reciprocating road sections as much as possible to obtain a plurality of sliding distance data, removing the maximum value and the minimum value in the plurality of sliding distance data, and then taking the arithmetic mean value of the rest sliding distance data as SInitialOr SDemolition work。
Further, in the second step, the front wheel brake calipers are firstly removed, the sliding distance from V to 0km/h of the speed of the test vehicle is obtained through re-measurement, and the sliding distance is recorded as S1And then detaching the rear wheel brake calipers to measure again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as S2Separately calculate S1And SInitialDifference value Δ S of1、S2And SInitialDifference value Δ S of2Comparison of Δ S1And Δ S2And respectively evaluating whether the dragging force of the front wheel brake caliper and the dragging force of the rear wheel brake caliper meet the requirements or not according to the size of the design threshold.
The invention respectively measures and obtains the sliding distance S before the brake calipers of the test vehicle are removed according to the GBT-12536 automobile sliding test methodInitialAnd a sliding distance S after the brake caliper is removedDemolition workCalculating SDemolition workAnd SInitialAnd comparing the difference value delta S with a design threshold value to evaluate whether the dragging force of the brake caliper meets the requirement or not, and the operation is convenient. Meanwhile, the verification is carried out on the whole vehicle, and compared with the existing bench verification test, the evaluation result is closer to the actual condition of the vehicle, namely the accuracy of the verification result is improved. And equipment does not need to be purchased or a testing device does not need to be developed, the verification period is short, and the manufacturing cost and the time cost are saved.
Drawings
FIG. 1 is a schematic flow chart of the method for evaluating the drag force of a brake caliper according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the method for evaluating the drag force of a brake caliper comprises the following steps:
step one, measuring the sliding distance from V to 0km/h of the speed of a test vehicle according to the GBT-12536 automobile sliding test method, and recording as SInitial. The method comprises the following steps of firstly preparing a test vehicle before a sliding test is carried out on the test vehicle, specifically: and inspecting the test vehicle to ensure that the vehicle condition meets the requirement, and then preheating for running for 15-20 min under the condition that the vehicle speed is 60-80 km/h, so that the automobile engine, the transmission system and other parts are preheated to a specified temperature state.
The sliding distance is measured specifically as follows: the test should be carried out in a dedicated test field, and the test road surface should be clean, dry, straight concrete or asphalt or the like, have a good adhesion coefficient, have a longitudinal slope of not more than 0.1%, and have a sufficient length to carry out the test. The test vehicle carries out a primary sliding test in the original vehicle state, a non-contact vehicle tester, namely VBOX test equipment, is connected, equipment setting is carried out, and the vehicle speed is recorded to be 40 km/h. And after the VBOX testing equipment is debugged, the speed of the test vehicle is increased to over 45km/h, and meanwhile, the VBOX testing equipment is started. Before a test vehicle is about to drive into a sliding section of a test field, an accelerator is loosened, a steering wheel is stabilized, and for the vehicle provided with a manual transmission, the gear of the manual transmission is placed in a neutral gear and a clutch pedal is loosened; and for a vehicle with the automatic transmission, the gear is placed in the N gear, so that the vehicle is in a linear free-sliding state for data acquisition. When the speed of the test vehicle is reduced to 40km/h, the test equipment starts recording until the speed is 0km/h, one point is recorded when the speed interval is less than or equal to 5km/h, and the sliding distance of the forward direction speed reduced from 40km/h to 0km/h is recorded.
Performing test round trip for six times, overlapping round trip road sections as much as possible to obtain a plurality of sliding distance data, removing the maximum value and the minimum value in the plurality of sliding distance data, and taking the arithmetic mean value of the rest sliding distance data as SInitialSee table 1 for specific experimental data.
TABLE 1 sliding distance before brake caliper removal
Step two, detaching the brake calipers of the test vehicle, then measuring again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as SDemolition work. The method specifically comprises the following steps: safely parking the test vehicle on a lifter, lifting the test vehicle by the lifter, removing the front wheel, removing the brake caliper on the front wheel brake disc, re-mounting the front wheel with the front wheel brake caliper removed on the test vehicle, re-measuring the test condition same as the step I to obtain the sliding distance of the test vehicle with the front wheel brake caliper removed from the range from 40km/h to 0km/h, and recording the sliding distance as S1. Similarly, the sliding distance of the test vehicle from V to 0km/h is obtained by detaching the rear wheel brake calipers and measuring again and is recorded as S2. See table 2 for specific experimental data.
TABLE 2 sliding distance after brake caliper removal
Step three, respectively calculating S1And SInitialDifference value Δ S of1、S2And SInitialDifference value Δ S of2，
ΔS1＝S1－SInitial＝678.5－606＝72.5m，ΔS2＝S2－SInitial＝641－606＝35m。
ΔS1+ΔS2The brake caliper drag force is not satisfactory and needs to be improved optimally, when the brake caliper drag force is 72.5+35 to 107.5m, which is larger than the design threshold value, namely 80 m.
Claims (4)
1. The method for evaluating the dragging force of the brake caliper is characterized by comprising the following steps of:
step one, measuring the sliding distance from V to 0km/h of the speed of a test vehicle according to the GBT-12536 automobile sliding test method, and recording as SInitial；
Step two, detaching the brake calipers of the test vehicle, then measuring again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as SDemolition work；
Step three, calculating SDemolition workAnd SInitialIf the delta S is not larger than the design threshold, the dragging force of the brake caliper is satisfied, and if the delta S is larger than the design threshold, the dragging force of the brake caliper is not satisfied.
2. The method of evaluating the drag force of a brake caliper according to claim 1, wherein: the method comprises the following steps of firstly preparing a test vehicle before a sliding test is carried out on the test vehicle, specifically: and inspecting the test vehicle to ensure that the vehicle condition meets the requirement, and then preheating for running for 15-20 min under the condition that the vehicle speed is 60-80 km/h.
3. The method of evaluating the drag force of a brake caliper according to claim 1 or 2, characterized in that: the sliding distance measurement in the first step and the second step is specifically as follows: recording the sliding distance from 40km/h to complete stop, namely 0km/h, of the test vehicle, performing the test at least for six times, overlapping the reciprocating road sections as much as possible to obtain a plurality of sliding distance data, removing the maximum value and the minimum value in the plurality of sliding distance data, and then taking the arithmetic mean value of the remaining sliding distance data as SInitialOr SDemolition work。
4. The method of evaluating the drag force of a brake caliper according to claim 1 or 2, characterized in that: in the second step, the front wheel brake calipers are firstly removed, the sliding distance of the test vehicle from V to 0km/h is obtained through re-measurement, and the sliding distance is recorded as S1And then detaching the rear wheel brake calipers to measure again to obtain the sliding distance of the test vehicle from V to 0km/h, and recording as S2Separately calculate S1And SInitialDifference value Δ S of1、S2And SInitialDifference value Δ S of2Comparison of Δ S1And Δ S2And respectively evaluating whether the dragging force of the front wheel brake caliper and the dragging force of the rear wheel brake caliper meet the requirements or not according to the size of the design threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210461265.6A CN114705345A (en) | 2022-04-28 | 2022-04-28 | Method for evaluating dragging force of brake caliper |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210461265.6A CN114705345A (en) | 2022-04-28 | 2022-04-28 | Method for evaluating dragging force of brake caliper |
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| CN114705345A true CN114705345A (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210461265.6A Withdrawn CN114705345A (en) | 2022-04-28 | 2022-04-28 | Method for evaluating dragging force of brake caliper |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983460A (en) * | 2014-04-29 | 2014-08-13 | 重庆长安汽车股份有限公司 | Vehicle internal resistance testing method |
| CN112179675A (en) * | 2020-09-25 | 2021-01-05 | 广州小鹏汽车科技有限公司 | Method and device for testing dragging energy consumption of electric automobile calipers |
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2022
- 2022-04-28 CN CN202210461265.6A patent/CN114705345A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983460A (en) * | 2014-04-29 | 2014-08-13 | 重庆长安汽车股份有限公司 | Vehicle internal resistance testing method |
| CN112179675A (en) * | 2020-09-25 | 2021-01-05 | 广州小鹏汽车科技有限公司 | Method and device for testing dragging energy consumption of electric automobile calipers |
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Application publication date: 20220705 |