CN113933069A - Method and system for testing liquid amount required by brake caliper - Google Patents
Method and system for testing liquid amount required by brake caliper Download PDFInfo
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- CN113933069A CN113933069A CN202111383700.XA CN202111383700A CN113933069A CN 113933069 A CN113933069 A CN 113933069A CN 202111383700 A CN202111383700 A CN 202111383700A CN 113933069 A CN113933069 A CN 113933069A
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- 239000007788 liquid Substances 0.000 title claims abstract description 325
- 238000012360 testing method Methods 0.000 title claims abstract description 217
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000003068 static effect Effects 0.000 claims description 22
- 238000011056 performance test Methods 0.000 claims description 6
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- 210000000080 chela (arthropods) Anatomy 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 3
- 230000035807 sensation Effects 0.000 description 2
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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
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The embodiment of the invention discloses a method and a system for testing liquid amount required by brake caliper. The testing method comprises the steps of obtaining testing parameters of a vehicle under a preset working condition; measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters; measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters; measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature; and estimating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data. According to the technical scheme provided by the embodiment of the invention, different working conditions of the vehicle are simulated in a high-temperature state, and the liquid demand of braking of the brake caliper is tested, so that certain data support is provided for calibrating an electronic vehicle body stabilizing system and pedal feeling of the whole vehicle, and the liquid demand of the whole vehicle is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of brake caliper testing, in particular to a method and a system for testing liquid amount required by brake calipers.
Background
When a passenger car with large weight and large moment of inertia is braked, the temperature of a brake disc is easy to rise. In the high-temperature state, parts in the brake caliper have different performances from those in the normal-temperature state, and the key performance parameter of the liquid demand of the vehicle is different.
However, the existing method for testing the liquid amount required by the brake caliper can only realize the test of the brake caliper in a normal temperature state, and cannot meet the test requirement of the liquid amount required by the brake caliper in a high temperature state.
The problem that the existing method for testing the liquid amount required by the brake caliper cannot meet the test requirement of the liquid amount required by the brake caliper in a high-temperature state becomes an urgent problem to be solved in the industry.
Disclosure of Invention
The embodiment of the invention provides a method and a system for testing the liquid amount required by a brake caliper, which aim to solve the problem that the liquid amount required by the brake caliper cannot be tested in a high-temperature braking state in the prior art.
In order to realize the technical problem, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for testing a liquid amount required by a brake caliper, including:
obtaining test parameters of a vehicle under a preset working condition;
measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters;
measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters;
measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature;
and estimating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, the measuring the first liquid demand data of the brake caliper in the normal temperature state according to the test parameters includes:
under the normal temperature state, measuring liquid demand data of the brake caliper under the braking working condition according to the test parameters;
and under the normal temperature state, measuring liquid demand data of the brake caliper under the static working condition according to the test parameters.
Optionally, the measuring second liquid demand data of the brake caliper in a high temperature state according to the test parameters includes:
measuring liquid demand data of the brake caliper at a first preset temperature according to the test parameters;
measuring liquid demand data of the brake caliper at a second preset temperature according to the test parameters;
and measuring liquid demand data of the brake caliper at a third preset temperature according to the test parameters.
Optionally, the measuring third liquid demand data of the brake caliper after the brake caliper is degraded to the normal temperature state through high temperature includes:
when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under a braking working condition;
and when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under a static working condition.
Optionally, after the measuring the third liquid demand data of the brake caliper after the high temperature decays to the normal temperature state, the method further includes:
pressurizing and releasing the brake caliper for a preset number of times;
and measuring the pressurized brake caliper and then subjecting the brake caliper to high-temperature liquid demand data.
Optionally, the measuring the pressurized brake caliper and the high-temperature liquid demand data includes:
measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to first preset temperature decay;
measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to second preset temperature decay;
and measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to decay at a third preset temperature.
Optionally, after the measuring the pressurized brake caliper and then experiencing the high-temperature liquid demand data, the method further includes:
and measuring liquid demand data of the brake caliper after pre-pressing and high-temperature decay in a normal temperature state.
Optionally, the measuring liquid amount data of the brake caliper after pre-pressing and high-temperature decay in the normal temperature state includes:
under the normal temperature state, the liquid demand data of the brake caliper after prepressing and high-temperature decay in the braking process;
and under the normal temperature state, the liquid amount required by the brake caliper under the static working condition after pre-pressing and high-temperature decay.
Optionally, before the measuring the second liquid demand data of the brake caliper in the high temperature state according to the test parameter, the method further includes:
running-in the brake caliper;
measuring liquid demand data of the brake caliper after running-in under the condition of simulating the braking condition at normal temperature on an inertia test bed;
and measuring the liquid demand data of the brake caliper after running-in under the static working condition on the inertia test bed under the simulated normal temperature state.
In a second aspect, an embodiment of the present invention further provides a system for testing a liquid amount required by a brake caliper, including a parameter obtaining module, configured to obtain a test parameter of a vehicle under a preset working condition;
the brake caliper basic performance test bed is used for measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters;
the inertia test bed is used for measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters;
the inertia test bed is also used for measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature;
and the evaluation module is used for evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
According to the method for testing the liquid amount required by the brake caliper, the actual vehicle is tested in different running states, corresponding test parameters are collected, the brake caliper basic performance test bed and the inertia test bed are input to form a database, then the measurement parameters required for measuring the liquid amount required by the brake caliper in different states in the vehicle running process are obtained respectively, a multi-step comparison test is carried out, and corresponding first liquid amount required data, second liquid amount required data and third liquid amount required data are obtained. Through carrying out contrastive analysis to each data value size, statistics braking pincers need the liquid measure under actual liquid measure and the normal atmospheric temperature state when braking high temperature to the standardization to the automotive electronics stable system and the footboard sensation of whole car provides data support, realize homoenergetic under normal atmospheric temperature state and high temperature state and test the braking pincers, satisfy the test needs of the required liquid measure of braking pincers under different operating modes, and to the difference when braking pincers need liquid measure and normal atmospheric temperature under the high temperature state, effectively rectify and provide the basis to the whole car, in order to perfect vehicle performance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing a liquid amount required by a brake caliper according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 3 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 4 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 5 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 6 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 7 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 8 is a flow chart of a method for testing the amount of fluid required by the brake caliper according to another embodiment of the present invention;
FIG. 9 is a flow chart of a method for testing the amount of fluid required by the caliper according to another embodiment of the present invention;
FIG. 10 is a structural diagram of a system for testing the amount of fluid required for a caliper according to an embodiment of the present invention;
FIG. 11 is a structural diagram of a fluid measurement system for a brake caliper according to another embodiment of the present invention;
fig. 12 is a structural view of a liquid amount test system for a brake caliper according to still another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Based on the above technical problem, the present embodiment proposes the following solutions:
the embodiment of the invention provides a method for testing liquid amount required by a brake caliper. FIG. 1 is a flow chart of a method for testing a liquid amount required by a brake caliper according to an embodiment of the present invention. As shown in fig. 1, a method for testing a liquid amount required for a brake caliper according to an embodiment of the present invention includes:
s101, obtaining test parameters of the vehicle under a preset working condition.
Specifically, the predetermined operating conditions may include actual conditions on the inertia test stand that simulate braking and/or standstill of the vehicle. The test parameters include, but are not limited to, a pressure value of the pre-pressing, the number of times of the pre-pressing, a pressurizing speed of the test pressure, a hydraulic pressure value when the test requires a liquid amount, a rotating speed of the brake disc and/or a hydraulic pressure when the brake disc is heated and dragged. The optimal solution of each test parameter for testing the liquid demand of the brake caliper under different running states of the vehicle is acquired by adjusting each parameter when the vehicle starts to brake at different deceleration from different initial running speeds in advance, the optimal solution is summarized and input into a basic performance test bed and an inertia test bed of the brake caliper to form a database, and the corresponding optimal test parameter can be acquired according to different rotating speeds of the brake caliper in the test of the liquid demand of the brake caliper under the high-temperature state.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
Specifically, in general, the test for the amount of liquid required for the caliper is generally performed while the vehicle is stationary in a normal temperature state. The first liquid demand data comprises liquid demand data when the inertia test bed simulates the preset working condition of the vehicle in the normal temperature state and the brake caliper works. According to the obtained normal temperature state, the vehicle tests all the test parameters used by the brake caliper liquid demand under the preset working condition, the corresponding liquid demand of the brake caliper under the preset working condition is measured on the inertia test bed, and first liquid demand data are obtained so as to obtain the liquid demand level of the brake caliper when a new vehicle leaves a factory.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
Specifically, the second liquid demand data includes a liquid consumption value measured when the brake caliper is simulated in a high-temperature state on the inertia test bed. Because the friction plate of the brake caliper can be in tight friction with the brake disc in the actual braking working condition process of the vehicle, friction force is generated, the vehicle speed is reduced through huge friction force, and the temperature of the brake caliper is increased along with the heat generated in the violent friction process. Therefore, the brake caliper operates in a high temperature state under the actual braking condition of the vehicle. Therefore, the brake disc is dragged on the inertia test bed to continuously increase the temperature, so that the state of the brake caliper of the vehicle during braking can be simulated. The temperature of brake disc can be obtained in real time through the temperature sensor who sets up in the brake disc, measures the liquid measure consumption of brake caliper under different temperatures, obtains the second and needs liquid measure data.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
Specifically, when the vehicle returns to normal running after braking, the brake caliper returns from a high temperature state to a normal temperature state. And the third liquid demand data is measured on the inertia test bed, the brake caliper is cooled to a normal temperature state after experiencing high temperature, and the third liquid demand data is obtained for liquid consumption values under different preset working conditions, so that the state change of the brake caliper after the vehicle performs braking and returns to normal is obtained.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Specifically, first liquid demand data obtained by measuring different preset working conditions of the brake caliper in a normal temperature state, second liquid demand data obtained by measuring a high temperature state, and third liquid demand data in different preset working conditions when the brake caliper regresses from the high temperature state to the normal temperature state, the first liquid demand data, the second liquid demand data and the third liquid demand data are compared and analyzed, and the difference between the high temperature state and the normal temperature state of the vehicle during braking is counted, so that the liquid demand of the brake caliper in different states is determined in the actual driving process of the vehicle, and an adjusting basis is provided for the actual liquid demand of the brake caliper when the vehicle leaves a factory.
According to the method for testing the liquid amount required by the brake caliper, the actual vehicle is tested in different running states, corresponding test parameters are collected, the brake caliper basic performance test bed and the inertia test bed are input to form a database, then the measurement parameters required for measuring the liquid amount required by the brake caliper in different states in the vehicle running process are obtained respectively, a multi-step comparison test is carried out, and corresponding first liquid amount required data, second liquid amount required data and third liquid amount required data are obtained. Through carrying out contrastive analysis to each data value size, statistics braking pincers need the liquid measure under actual liquid measure and the normal atmospheric temperature state when braking high temperature to the standardization to the automotive electronics stable system and the footboard sensation of whole car provides data support, realize homoenergetic under normal atmospheric temperature state and high temperature state and test the braking pincers, satisfy the test needs of the required liquid measure of braking pincers under different operating modes, and to the difference when braking pincers need liquid measure and normal atmospheric temperature under the high temperature state, effectively rectify and provide the basis to the whole car, in order to perfect vehicle performance.
Optionally, fig. 2 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S201, measuring liquid demand data of the brake caliper under the braking working condition according to the test parameters under the normal temperature state.
In particular, the braking conditions may include different braking states during vehicle travel, such as: when the vehicle runs stably, when the front road junction meets a red light, a driver can smoothly step on 1/2 of the brake pedal to finish braking and stopping; when the vehicle normally runs, a small animal suddenly rushes out of the front of the vehicle to the center of the road, at the moment, a driver can quickly respond, 3/4 for immediately pressing the brake pedal is pressed down, and even all the brake pedal is pressed down, so that the braking can be finished. Under the normal temperature test condition, at normal temperature such as 25 ℃, 15 ℃ or 30 ℃ and the like, a rotating speed is applied to the brake disc to drive the brake caliper to be tested to rotate, and liquid demand data of the brake caliper under the simulated brake working condition is measured. Illustratively, pressurizing the brake caliper to 4MPa and releasing the pressure are repeatedly performed for 5 times, and the brake caliper idles for 120s without pressurization at a rotating speed of 80km/h so as to separate the brake caliper pads from the brake disc before the braking operation is not performed. And then applying hydraulic pressure to 8MPa at a pressurizing speed of 0.4MPa/s, and detecting liquid consumption data of the brake caliper under the normal-temperature braking condition.
And S202, measuring liquid demand data of the brake caliper under the static working condition according to the test parameters at the normal temperature.
Specifically, the braking condition and the static condition in the preset condition can include all running states of the vehicle, the liquid demand of the brake caliper under the braking condition and the static condition is measured respectively, the test result can be more accurate, and the provided data is more convincing. Illustratively, on the inertia test stand, pressurizing the brake caliper to 4MPa and releasing the pressure are repeatedly performed for 5 times, and then 120S is waited to keep the time parameter in the step S201 as a fixed value, so as to eliminate the influence on the test caused by different idle time in the braking working condition and the static working condition. And then, applying hydraulic pressure to 8MPa at the pressurizing speed of 0.4MPa/s, and detecting liquid consumption data of the brake caliper under the normal temperature state and the static working condition.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 3 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S301, according to the test parameters, measuring liquid demand data of the brake caliper at a first preset temperature.
In particular, the first preset temperature may comprise the temperature at which the brake caliper is at when the vehicle is lightly braking. When a driver actually drives, the temperature of the brake caliper can be increased to about 100 ℃ by lightly touching the brake pedal. For example, the first preset temperature may be set to 90 ℃, 100 ℃, or 120 ℃ or the like, without any limitation. Illustratively, a speed of 50km/h is applied to a brake disc to drive a brake caliper to rotate, a hydraulic pressure of 1MPa is applied to the brake caliper, the temperature of the brake disc is dragged to a first preset temperature, for example, 100 ℃, then the application of a rotating speed is stopped, the brake caliper stops rotating, the hydraulic pressure is applied to 8MPa at a pressurizing speed of 0.4MPa/s, pressurization is carried out for 3 times, and liquid consumption data of the brake caliper at each time are detected to obtain liquid demand data of the brake caliper when a pedal is lightly braked.
S302, measuring liquid demand data of the brake caliper at a second preset temperature according to the test parameters.
Specifically, the second preset temperature may be a temperature that the brake caliper may reach when the driver depresses 1/2 the brake pedal during actual driving, and may be, for example, 300 ℃, 305 ℃, 290 ℃, 320 ℃ or the like, without any limitation. It should be noted that the second preset temperature is greater than the first preset temperature. Exemplarily, on an inertia test bed, the temperature of the brake disc is dragged to 300 ℃, the rest of the test operations and parameters are the same as those in step S301, which are not described herein again, and the liquid demand data of the brake caliper at the second preset temperature is obtained through measurement.
And S303, measuring liquid demand data of the brake caliper at a third preset temperature according to the test parameters.
In particular, the third preset temperature may be the temperature reached by the brake caliper when the driver brakes suddenly in an emergency during actual driving. Illustratively, the third preset temperature may be 500 ℃, 505 ℃, 490 ℃, or 520 ℃, etc., without any limitation. It should be noted that the third preset temperature is greater than the second preset temperature. Exemplarily, the temperature of the brake disc is dragged to 500 ℃, the rest test operations and parameters are the same as those in step S301, which are not described herein, and the liquid demand data of the brake caliper when the brake caliper reaches the third preset temperature under the emergency braking condition of the vehicle is obtained through measurement.
It should be noted that, in the actual braking process of the vehicle, the temperature of the brake caliper is raised due to the heat generated during friction braking, the temperature raising range is about 100-. For example: the first preset temperature may be 100 ℃, and the second preset temperature and the third preset temperature may be 300 ℃ and 500 ℃; the first preset temperature may also be 150 deg.c, and the second and third preset temperatures may be 300 deg.c and 450 deg.c.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 4 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
S401, when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under the braking working condition.
Specifically, when the vehicle actually runs, the driver steps on the brake pedal and then releases the brake pedal, the vehicle continues to run normally, and in the process, the temperature of the brake caliper is increased firstly and then is reduced to the normal temperature, so that the liquid demand of the brake caliper when the brake caliper is subjected to high temperature and then is reduced to the normal temperature is measured, and the liquid demand of the brake caliper when the vehicle continues to run normally after once braking or continuous multiple times of braking can be obtained. For example, on the inertia test bed, after the temperature of the brake disc is dragged to a certain value, the temperature is reduced to a normal temperature state, and the rest of the test operations and parameters are the same as those in step S201, which is not described herein again. Therefore, the liquid demand data of the brake caliper can be obtained when the vehicle continues to run after being braked.
S402, measuring liquid demand data of the brake caliper under a static working condition when the brake caliper is degraded to a normal temperature state through high temperature.
Specifically, when the vehicle actually runs, the driver steps on the brake pedal and then releases the brake pedal, the vehicle stops, the brake caliper experiences high temperature and then falls to a normal temperature state, and the vehicle is in a static working condition. And measuring the liquid demand of the brake caliper under the static working condition after the brake caliper is degenerated to the normal temperature at high temperature, and obtaining the liquid demand of the brake caliper after the vehicle is braked and stopped. Exemplarily, on the inertia test bed, after dragging the temperature of the brake disc to a certain value, the temperature is declined to a normal temperature state, and the liquid demand data of the brake caliper is measured, and the rest of the test operations are the same as those in step S202, which are not described herein again.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 5 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S501, pressurizing the brake caliper and releasing pressure, and repeating preset times.
Specifically, the prepressing step of the test of the liquid quantity needed by the brake caliper is completed by pressurizing the brake caliper to a certain pressure and then releasing the pressure repeatedly. After the brake caliper which is newly delivered from a factory is completely exhausted, substances such as air, impurities and the like still remain in the brake caliper, and the accuracy of the test result of the liquid amount needed by the test of the brake caliper can be influenced. Therefore, multiple times of prepressing are carried out before testing, and the brake fluid is filled in the inner cavity of the whole brake caliper during each prepressing, so that the brake caliper can normally work under an ideal condition within an error allowable range, and the influence of external interference factors on a test result is reduced. The number of times of prepressing can be obtained from a pre-constructed database according to the test working condition.
And S502, measuring the pressurized brake caliper and then subjecting the brake caliper to high-temperature liquid demand data.
Specifically, the brake caliper after prepressing is closer to an ideal working state, liquid demand data of the brake caliper at high temperature after the influence of interference factors is reduced by prepressing is obtained through testing, and the liquid demand data is compared with data measured at high temperature without prepressing, so that test result data is optimized.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 6 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S501, pressurizing the brake caliper and releasing pressure, and repeating preset times.
S5021, measuring the liquid demand of the brake caliper subjected to pre-pressing after the brake caliper is subjected to first preset temperature decay.
Specifically, after the influence of interference factors is reduced through prepressing, the brake caliper can measure the liquid demand data by simulating the condition that the vehicle is braked and then returns to a normal state, and the influence of the prepressing on the liquid demand of the brake caliper can be known when the vehicle lightly steps on a brake pedal in operation. For example, the brake disc is rotated at a speed of 50km/h on an inertia test stand, a hydraulic pressure of 1MPa is applied to the caliper, the temperature of the brake disc is dragged to 100 ℃, the caliper is pressurized to 4MPa and the pressure is released, the operation is repeated 5 times, the brake disc is idled at a speed of 80km/h for 120s, and then the brake disc is stopped, the temperature is reduced to normal temperature, a hydraulic pressure of 8MPa is applied at a pressurizing speed of 0.4MPa/s, and the liquid demand of the caliper at this time is measured. The brake caliper is lowered from a high temperature to a normal temperature state, which may include a temperature around 50 ℃, and is not limited herein.
S5022, measuring the liquid demand of the brake caliper subjected to pre-pressing after the brake caliper is subjected to second preset temperature decay.
Exemplarily, the temperature of the brake disc is dragged to 300 ℃, the brake caliper is pre-pressed, and the rest test operations and parameters are the same as those in step S5021, which is not repeated herein.
S5023, measuring the liquid demand of the brake caliper subjected to pre-pressing after the brake caliper is subjected to decay at a third preset temperature.
Exemplarily, the temperature of the brake disc is dragged to 500 ℃, and the rest test operations and parameters are the same as those in step S5021, which are not described herein again.
After the prepressing is measured, the liquid demand of the brake caliper is reduced to the normal temperature after three preset temperatures, so that the test result is more practical and has reference.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 7 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 7, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S501, pressurizing the brake caliper and releasing pressure, and repeating preset times.
And S502, measuring the pressurized brake caliper and then subjecting the brake caliper to high-temperature liquid demand data.
S601, measuring liquid demand data of the brake caliper after pre-pressing and high-temperature decay in a normal temperature state.
Specifically, for the situation after the vehicle is degenerated to the normal temperature through pre-pressing and high-temperature braking, the liquid demand of the brake caliper at the normal temperature can be measured when the vehicle is recovered to be normal after actual braking, so that the situation that the pedal feeling of the vehicle is possibly abnormal is optimized and improved. Pedal paresthesia may include the same amount of depression of the brake pedal, but the deceleration may become small, failing to reduce the vehicle speed to a certain value or stop within a certain distance.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 8 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 8, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S501, pressurizing the brake caliper and releasing pressure, and repeating preset times.
And S502, measuring the pressurized brake caliper and then subjecting the brake caliper to high-temperature liquid demand data.
S6011, and under the normal temperature state, pre-pressing and high-temperature decay are carried out on the liquid amount data needed by the brake caliper in the braking process.
Specifically, the pedal feel of the vehicle can be further optimized by measuring the liquid demand of the brake caliper when the vehicle is braked and then returns to normal running after pre-pressing. For example, after the vehicle is pre-pressurized and decayed to the normal temperature state through high temperature, the test operation of step S201 is repeated, and the liquid consumption value of the brake caliper is measured when the vehicle is restored from the braking state to the normal driving state after the pre-pressurization.
S6012, under the normal temperature state, pre-pressing and high-temperature decay are conducted on the liquid amount data needed by the brake caliper under the static working condition.
Specifically, the required liquid amount of the brake caliper when the vehicle stops after being pre-pressed and braked is measured, the required liquid amount data of the brake caliper of the vehicle under various working conditions in actual operation can be sufficiently counted, the test result of the required liquid amount data of the brake caliper is more complete, and the accuracy of the required liquid amount test of the brake caliper is improved. For example, after the brake caliper is pre-compressed and decayed to normal temperature through high temperature, the test operation of step S202 is repeated to measure the liquid demand of the brake caliper.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, fig. 9 is a flowchart of a method for testing a liquid amount required by a brake caliper according to another embodiment of the present invention. On the basis of the above embodiment, referring to fig. 9, the method for testing the liquid amount required by the brake caliper, provided by the embodiment of the invention, comprises the following steps:
s101, obtaining test parameters of the vehicle under a preset working condition.
And S102, measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
And S701, running in the brake caliper.
Specifically, in the embodiment, a running-in method specified in the conventional SAE 2521 is adopted, and the brake caliper is subjected to running-in treatment, so that a friction plate of the brake caliper and a brake disc are attached more tightly, the influence of interference factors on a liquid demand test is reduced, a result is optimized, and the pedal feeling of the whole vehicle and the calibration of an electronic stability system of the vehicle are further optimized.
S702, measuring liquid demand data of the brake caliper after running-in under the condition of simulating the braking condition at normal temperature on an inertia test bed.
Specifically, the state of the brake caliper can be improved through running-in, interference of external factors can be further reduced through measuring liquid demand data of the brake caliper after running-in, and the liquid demand data of the brake caliper under the normal-temperature braking working condition is measured, so that the influence of the brake caliper on the liquid demand during braking in the driving process of the vehicle after running-in is obtained.
S703, measuring the liquid demand data of the brake caliper after running-in under the static working condition simulated at normal temperature on the inertia test bed.
Similarly, after carrying out the break-in to braking pincers, measure the braking pincers liquid measure demand data under the static operating mode of normal atmospheric temperature, can make the test result more laminate actual conditions, further promote the degree of accuracy that braking pincers need the liquid measure to test.
S103, measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
And S104, measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And S105, evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
The embodiment of the invention also provides a system for testing the liquid amount required by the brake caliper. Fig. 10 is a structural diagram of a liquid amount testing system for a brake caliper according to an embodiment of the present invention. Referring to fig. 10, a system 50 for testing a liquid amount required for a brake caliper according to an embodiment of the present invention includes:
the parameter obtaining module 10 is configured to obtain test parameters of the vehicle under a preset working condition.
And the brake caliper basic performance test bed 20 is used for measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters.
And the inertia test bed 30 is used for measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters.
The inertia test bed 30 is also used for measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature.
And the evaluation module 40 is used for evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
Optionally, with reference to fig. 10, on the basis of the above embodiment, the inertia test stand 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the brake caliper in the braking condition according to the test parameters at normal temperature. And under the normal temperature state, measuring liquid demand data of the brake caliper under the static working condition according to the test parameters.
Optionally, with reference to fig. 10, on the basis of the above embodiment, the inertia test bed 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the brake caliper at the first preset temperature according to the test parameters. And measuring liquid demand data of the brake caliper at a second preset temperature according to the test parameters. And measuring liquid demand data of the brake caliper at a third preset temperature according to the test parameters.
Optionally, with reference to fig. 10, on the basis of the above embodiment, the inertia test bed 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the brake caliper in the braking condition when the amount of liquid required by the brake caliper declines to the normal temperature state after a high temperature. And when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under a static working condition.
Fig. 11 is a structural view of a liquid amount test system for a brake caliper according to still another embodiment of the present invention. Referring to fig. 11, the system 50 for testing the amount of liquid required for a brake caliper according to the embodiment of the present invention further includes:
and a pre-pressing module 60 for pressurizing and releasing the brake caliper for a preset number of times.
The inertia test stand 30 is also used for measuring the pressurized brake caliper and then the high-temperature liquid demand data.
Optionally, with reference to fig. 11, on the basis of the above embodiment, the inertia test stand 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the pre-pressurized brake caliper after the brake caliper is subjected to the first preset temperature decay. And measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to the second preset temperature decay. And measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to third preset temperature decay.
Optionally, with reference to fig. 11, on the basis of the above embodiment, the inertia test bed 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the brake caliper in the normal temperature state after the brake caliper is subjected to pre-compression and high-temperature decay.
Optionally, with reference to fig. 11, on the basis of the above embodiment, the inertia test stand 30 in the system 50 for testing the amount of liquid required by the brake caliper according to the embodiment of the present invention is further configured to measure the amount of liquid required by the pre-pressurized brake caliper after the brake caliper is subjected to the first preset temperature decay. And measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to the second preset temperature decay. And measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to third preset temperature decay.
Fig. 12 is a structural view of a liquid amount test system for a brake caliper according to still another embodiment of the present invention. Referring to fig. 12, the system 50 for testing the amount of liquid required for a brake caliper according to the embodiment of the present invention further includes:
and the running-in module 70 is used for running in the brake caliper.
The inertia test bed 30 is also used for measuring the liquid demand data of the brake caliper after running-in under the condition that the brake working condition is simulated on the inertia test bed under the normal temperature state; and measuring the liquid demand data of the brake caliper after running-in under the static working condition on the inertia test bed under the simulated normal temperature state.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for testing the liquid amount required by a brake caliper is characterized by comprising the following steps:
obtaining test parameters of a vehicle under a preset working condition;
measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters;
measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters;
measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature;
and estimating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
2. A method for testing a liquid amount required for a brake caliper according to claim 1, wherein said measuring first liquid amount required data of the brake caliper at a normal temperature state based on the test parameter includes:
under the normal temperature state, measuring liquid demand data of the brake caliper under the braking working condition according to the test parameters;
and under the normal temperature state, measuring liquid demand data of the brake caliper under the static working condition according to the test parameters.
3. A method for testing a liquid amount required for a brake caliper according to claim 1, wherein said measuring second liquid amount required data of the brake caliper in a high temperature state based on the test parameter includes:
measuring liquid demand data of the brake caliper at a first preset temperature according to the test parameters;
measuring liquid demand data of the brake caliper at a second preset temperature according to the test parameters;
and measuring liquid demand data of the brake caliper at a third preset temperature according to the test parameters.
4. The method for testing the liquid amount required for a brake caliper according to claim 1, wherein the measuring of the third liquid amount required data of the brake caliper after the deterioration from a high temperature to a normal temperature state includes:
when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under a braking working condition;
and when the brake caliper is degraded to a normal temperature state through high temperature, measuring liquid demand data of the brake caliper under a static working condition.
5. The method for testing the liquid amount required for a brake caliper according to claim 1, further comprising, after said measuring third liquid amount required data of the brake caliper when the measured liquid amount decays to a normal temperature state after a high temperature, the steps of:
pressurizing and releasing the brake caliper for a preset number of times;
and measuring the pressurized brake caliper and then subjecting the brake caliper to high-temperature liquid demand data.
6. A method for testing the amount of liquid required for a brake caliper according to claim 5, wherein said measuring the amount of liquid required for the brake caliper after pressurization and after high temperature includes:
measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to first preset temperature decay;
measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to second preset temperature decay;
and measuring the liquid demand of the brake caliper subjected to prepressing after the brake caliper is subjected to decay at a third preset temperature.
7. A method for testing liquid amount required for a brake caliper according to claim 5, further comprising, after said measuring the pressurized brake caliper and then subjecting the pressurized brake caliper to the high temperature liquid amount required data:
and measuring liquid demand data of the brake caliper after pre-pressing and high-temperature decay in a normal temperature state.
8. A method for testing liquid amount required by a brake caliper according to claim 7, wherein said measuring data of liquid amount required by said brake caliper after pre-compression and high-temperature decay at normal temperature comprises:
under the normal temperature state, the liquid amount required by the brake caliper under the braking working condition after prepressing and high-temperature decay;
and under the normal temperature state, the liquid amount required by the brake caliper under the static working condition after pre-pressing and high-temperature decay.
9. A method for testing a liquid amount required for a brake caliper according to claim 1, before said measuring second liquid amount required data of the brake caliper in a high temperature state based on said test parameters, further comprising:
running-in the brake caliper;
measuring liquid demand data of the brake caliper after running-in under the condition of simulating the braking condition at normal temperature on an inertia test bed;
and measuring the liquid demand data of the brake caliper after running-in under the static working condition on the inertia test bed under the simulated normal temperature state.
10. A liquid amount test system required by brake caliper is characterized by comprising:
the parameter acquisition module is used for acquiring test parameters of the vehicle under a preset working condition;
the brake caliper basic performance test bed is used for measuring first liquid demand data of the brake caliper in a normal temperature state according to the test parameters;
the inertia test bed is used for measuring second liquid demand data of the brake caliper in a high-temperature state according to the test parameters;
the inertia test bed is also used for measuring third liquid demand data of the brake caliper when the brake caliper is degraded to a normal temperature state through high temperature;
and the evaluation module is used for evaluating the actual liquid demand of the brake caliper on the vehicle according to the first liquid demand data, the second liquid demand data and the third liquid demand data.
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