CN114740831B - Test method of test bench for EPB model verification and parameter matching and EPB system - Google Patents
Test method of test bench for EPB model verification and parameter matching and EPB system Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
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- G—PHYSICS
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Abstract
The invention discloses a test method of a test bench for EPB model verification and parameter matching and an EPB system, wherein the test bench for EPB model verification and parameter matching comprises a temperature box, a rack, a brake simulation module, a clamping force test module, an MGU rotating speed detection module and a temperature measurement module. The scheme can adapt to motors of different models, ensures the accuracy of the EPB system, and meanwhile, the EPB system verified and adjusted by the method can adjust and calibrate the clamping force according to the ambient temperature, and can adapt to different requirements of automobiles on the clamping force under different working conditions.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method for verifying a test bench matched with parameters by an EPB model and an EPB system verified and adjusted by the method.
Background
An electronic parking system (EPB for short) is commonly used for completing parking braking of a vehicle at present, clamping force control is adopted in a clamping process of motor control of the EPB, and stroke control is adopted in a releasing process of the EPB. In consideration of cost, the clamping force of the calipers and the actual backspacing stroke are obtained through calculation of the current and the voltage of the motor, different motor control parameters are needed to be adopted for different control motors due to the fact that different manufacturers have larger difference of the motors used by the EPB, meanwhile, the models of the brakes are different, the clamping force and the calibration positions of piston backspacing are also different, and therefore the models need to be tested and matched in an EPB rack after the models are built, and the models can meet the precision requirement through parameter adjustment.
In addition, under the influence of environment, temperature and the like, a certain difference also exists between the clamping force exerted on the brake disc by the caliper and the actual clamping force exerted on the brake disc, however, in order to ensure the accuracy of the braking action and reduce the loss of the friction material, the relation between the actual clamping force exerted on the brake disc and the calibrated clamping force in the EPB system must be considered in the testing process.
Generally, the EPB motor control model test and matching requires comparing the actual clamping force and actual backspacing with the results obtained by the EPB controller through current and voltage estimation, and generally speaking, a pressure sensor scheme can be adopted to obtain relevant parameters instead of a method of a brake disc.
However, in actual conditions, the influence of temperature on the EPB function is also involved, and the current model generally obtains the current brake disc temperature through estimation of a temperature rise and drop model. If the working condition needs to be simulated, the EPB needs to be continuously operated when the brake disc rotates, so that the temperature of the brake disc is increased, then the brake disc is made to be static, the EPB is in a clamping state, and the clamping force loss condition is observed.
Because the influence of brake disc temperature on final braking force is involved in the EPB model, the rack needs to be capable of adapting to the rotation of the brake disc, and the scheme of adopting a general pressure sensor can generate a large amount of heat during braking and the pressure sensor has large abrasion, so that the scheme of using the pressure sensor to replace the brake disc to measure clamping force is not suitable for simulating the working condition.
Disclosure of Invention
Therefore, to solve the above problems, the present invention provides a test method of a test bench for EPB model verification and parameter matching and an EPB system.
The invention is realized by the following technical scheme:
a test rig for EPB model verification and parameter matching, comprising:
the rack is arranged in the temperature box and at least comprises a base and a mounting bracket vertically arranged on the base;
the brake simulation module comprises a rotating shaft which is rotatably arranged on the mounting bracket, a coupler is coaxially arranged at one end of the rotating shaft, which is far away from the mounting bracket, the rotating shaft is driven by a driving motor and drives the coupler to rotate in the same direction, a brake disc is detachably arranged on the coupler, and a caliper for clamping the brake disc is also arranged on the rack;
the clamping force testing module comprises a strain gauge, a force sensor and a control module, wherein the strain gauge is arranged outside the caliper, a strain conversion circuit is arranged in the strain gauge, the voltage of the strain conversion circuit is detected through voltage detection equipment, and the voltage data of the strain conversion circuit is transmitted to a terminal of an upper computer;
the MGU rotating speed detection module comprises a photoelectric counter which is fixed on the mounting bracket and is aligned with an MGU driving gear of an MGU motor arranged in the calipers, and the photoelectric counter transmits the number of rotating teeth of the MGU driving gear to the terminal of an upper computer in real time and measures and calculates the backspacing stroke of a piston in the calipers through a formula;
and the temperature measuring module comprises an infrared temperature measuring device arranged in the temperature box.
A testing method for an EPB system to verify a test bench matched with parameters, using a test bench for EPB model verification matched with parameters as described above for testing, comprising the steps of:
s1: measuring and calculating the relation between the clamping force and the voltage of the strain conversion circuit;
s2: under the static state of the brake disc, the EPB system is used for controlling the calipers to clamp the brake disc and detecting the actual clamping force borne by the brake disc, and the actual clamping force data is used for replacing the original calibrated clamping force in the EPB system;
s3: under the static state of the brake disc, the EPB system is used for controlling the caliper to release, measuring and calculating the actual backspacing stroke of the piston in the caliper, and the original target backspacing stroke in the EPB system is replaced by the actual backspacing stroke data of the piston;
s4: and detecting the change of the clamping force and the temperature change of the brake disc under the high-temperature re-clamping state, measuring and calculating the relation between the actual clamping force and the temperature change of the brake disc, and programming the relation into an EPB system.
Preferably, the step S1 specifically includes:
s11: fixing the force sensor and the coupler;
s12 Upper computer terminal controls the clamp force sensor to continuously clamp the clamp force by using the clamp force of 0KN-30KN and the frequency of once every 1KNThe force sensor records the clamping force sensed by each clamping and transmits data to the terminal of the upper computer, and meanwhile, the voltage detection equipment detects the voltage of the strain conversion circuit after each clamping of the caliper on the sensor in real time and records the voltage as U 1 、U 2 、U 3 ……U 30 And transmitting the data to an upper computer terminal;
and S13, the upper computer terminal calculates the data relation between the clamping force sensed by the force sensor and the voltage of the corresponding strain conversion circuit and programs the data relation into the EPB system.
Preferably, after step S1 is completed, the force sensor is detached from the coupling, and the brake disc is fixed to the coupling.
Preferably, the step S2 specifically includes:
s21: the EPB system is used for controlling the calipers to clamp the brake disc, and the voltage detection equipment detects the voltage of the strain conversion circuit in real time and transmits voltage data to an upper computer terminal;
s22: the upper computer terminal measures and calculates the actual clamping force F borne by the brake disc according to the relation between the voltage of the strain conversion circuit and the clamping force Fruit of Chinese wolfberry Will apply an actual clamping force F Fruit of Chinese wolfberry Programming into the EPB system to establish a new nominal clamping force F Sign board ；
S23: updating the calibrated clamping force F by going through step S22 Sign The subsequent EPB system controls the calipers to clamp the brake disc, and new actual clamping force F is obtained through measurement and calculation Fruit of Chinese wolfberry Determining a new actual clamping force F Fruit of Chinese wolfberry With the calibrated clamping force F in current EPB systems Sign board Whether or not equal to F Fruit of Chinese wolfberry ≠F Sign board When F is reached, steps S21 and S22 are repeated Fruit of Chinese wolfberry = F Sign board At the moment, the actual clamping force F Fruit of Chinese wolfberry Programmed into the EPB system as a final calibrated clamping force F Sign board 。
Preferably, the step S3 specifically includes:
s31: the EPB system is used for controlling the calipers to be released to a calibration position, and at the moment, the photoelectric counter records the number of rotating teeth of the MGU driving gear and transmits data to the terminal of the upper computer;
s32: according to the return of the pistonThe actual retraction stroke S of the piston is measured and calculated by a relational formula of the retraction stroke and the number of rotating teeth of the MGU driving gear Fruit of Chinese wolfberry Will actually retreat the stroke S Fruit of Chinese wolfberry Is programmed into an EPB system to replace the original target backspacing stroke S Sign board ；
S33: the target retraction stroke S is updated by passing through step S32 Sign board The subsequent EPB system controls the calipers to be released to the calibration position, and a new actual backspacing stroke S is obtained through measurement and calculation Fruit of Chinese wolfberry Judging a new actual backspacing stroke S Fruit of Chinese wolfberry With the target backspacing stroke S in the current EPB system Sign board Whether or not to be equal when S Fruit of Chinese wolfberry ≠S Sign board When so, repeating steps S31 and S32, when S Fruit of Chinese wolfberry = S Sign board At the moment, the actual backspacing stroke S at the moment Fruit of Chinese wolfberry Programmed into the EPB system as a final target backspacing stroke S Sign 。
Preferably, the relationship between the retraction stroke of the piston and the number of rotating teeth of the MGU drive gear is calculated by the following formula:
wherein the actual retraction stroke of the piston in the caliper is s, the number of the rotating teeth of the MGU driving gear is z, the gear module is m, and the transmission ratio of the MGU is i 1 The screw sleeve transmission ratio is i 2 。
Preferably, the step S4 specifically includes:
s41: the driving motor drives the rotating shaft to rotate and drives the coupler and the brake disc to rotate, and the calipers are controlled to clamp and release repeatedly until the temperature in the temperature box reaches 400-500 ℃ and then stop rotating;
s42: after the brake disc stops rotating, the EPB system controls the calipers to clamp the heated brake disc, and at the moment, the voltage detection equipment detects the voltage of the strain conversion circuit in real time and transmits voltage data to an upper computer terminal;
s43: and the upper computer terminal calculates and calculates the clamping force of the caliper in the high-temperature state according to the relation between the voltage of the strain conversion circuit and the clamping force, and records the clamping force in the high-temperature state into the EPB system.
Preferably, the step S4 further includes:
s44: monitoring the temperature change of the brake disc in a high-temperature gradual cooling state by using an infrared temperature measuring device, continuously clamping the brake disc by using calipers in the temperature cooling process, measuring and calculating the clamping force borne by the brake disc during each clamping according to the relation between the voltage of the strain conversion circuit and the clamping force, and transmitting data to an upper computer terminal;
s45: and obtaining a change relation curve between the temperature and the clamping force borne by the brake disc according to the data of the clamping force borne by the brake disc at different temperatures recorded in the upper computer terminal, and compiling the relation curve into the EPB system.
An EPB system is verified and adjusted according to the test method of the test bench for verifying the EPB model and matching the parameters.
The technical scheme of the invention has the following beneficial effects:
1. according to the scheme, under the condition that the brake disc rotates, the calipers clamp and release for multiple times to simulate the high-temperature state of the brake after multiple times of braking, the calipers are continuously clamped again after the brake disc stops rotating, and the change of clamping force at different temperatures is known through measuring and calculating the temperature change in the temperature box, so that the system is more flexible in controlling the clamping force of the calipers in practical application, and the braking of an automobile under different environments is facilitated.
2. Detect and match the brake disc and receive the clamp force and calliper and apply the relation of clamp force difference through the test bench in this scheme, ensure that the clamp force that the brake disc receives accords with the demarcation clamp force, can adapt to the motor of different models, ensure the accuracy nature of EPB system.
3. According to the scheme, before data such as clamping force, backspacing stroke, temperature and clamping force relation and the like are coded into the EPB system, the test is repeatedly carried out, after the result of the repeated test is ensured to be consistent with the previous result, the data are coded into the system, and the accuracy of new data coded into the EPB system is ensured.
Drawings
FIG. 1: the structural diagram of the test bench for EPB model verification and parameter matching is shown in the invention;
FIG. 2 is a schematic diagram: is a schematic view of the installation position of the strain gauge and the caliper;
FIG. 3: is the variation relation curve of time and clamping force under different initial temperatures in step S46;
FIG. 4: is a process flow diagram of the test method of the test bench for EPB model verification and parameter matching in the present invention.
Detailed Description
In order that the objects, advantages and features of the invention may be more clearly and specifically shown and described, there shall now be seen and explained, by way of non-limiting illustration of preferred embodiments. The embodiment is only a typical example of the technical solution of the present invention, and any technical solution formed by adopting equivalent replacement or equivalent transformation falls within the scope of the present invention.
It is also stated that in the description of the schemes, it is to be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first" and "second" in this document are used for descriptive purposes only and are not to be construed as indicating or implying a ranking of importance or an implicit indication of the number of technical features shown. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention discloses a test method of a test bench for EPB model verification and parameter matching and an EPB system.
Specifically, the method is used for matching various parameters of the EPB system with various parameters of the tested brake, obtaining clamping force borne by a brake disc in the clamping process of the brake under different conditions and the backspacing stroke of a piston in a caliper in the releasing process of the brake through testing, and inputting the parameters obtained through testing and a correlation formula into the EPB system to replace the original parameters, thereby improving the adaptability of the EPB system and the tested brake and providing the accuracy of various parameters of the EPB system under different temperature environments.
As shown in FIGS. 1 and 2, the testing bench for EPB model verification and parameter matching comprises a temperature box, a rack, a brake simulation module, a clamping force testing module, an MGU rotating speed detection module and a temperature measurement module.
Specifically, the rack is arranged in a temperature box and at least comprises a base 1 and a mounting bracket 2 vertically arranged on the base 1, and the temperature box is used for controlling the stability of the temperature in the box in the test process.
Specifically, the braking simulation module is including rotationally setting up pivot 4 in the frame, pivot 4 sets up perpendicularly on installing support 2, and it is kept away from the coaxial shaft coupling 5 that is provided with of one end of installing support 2, pivot 4 passes through driving motor drive and drives shaft coupling 5 produces the syntropy and rotates, driving motor sets up on installing support 2, by host computer terminal control driving motor rotates and closes, be provided with brake disc 3 on the shaft coupling 5 detachably, still be provided with calliper 6 that is used for pressing from both sides tight brake disc 3 in the frame.
Specifically, clamp force test module includes foil gage 8, and calliper 6 that this scheme was tested is the electricity calliper, foil gage 8 sets up in calliper 6 outsides, specifically, foil gage 8 sets up the top of calliper 6 casing is provided with the conversion circuit of meeting an emergency in the foil gage 8, the voltage of conversion circuit of meeting an emergency detects through voltage detection equipment, voltage detection equipment detects out and transmits the voltage data of conversion circuit of meeting an emergency to host computer terminal behind the conversion circuit of meeting an emergency internal voltage, clamp force test module still includes and replaces brake disc 3 and be connected with shaft coupling 5 for the force sensor of the clamp force that test brake disc 3 receives.
Specifically, in order to construct a relation formula between the clamping force applied to the brake disc 3 and the voltage of the strain conversion circuit in the strain gauge 8, and convert the clamping force applied to the brake disc 3 by using the voltage of the strain conversion circuit in subsequent tests, the voltage of the strain conversion circuit in the strain gauge 8 needs to be detected in real time by the force sensor when the caliper 6 applies different clamping forces (at the moment, the clamping force applied to the force sensor changes), so as to better simulate the relation between the clamping force applied to the brake disc 3 and the voltage of the strain conversion circuit, in the scheme, the force sensor is disc-shaped and can replace the brake disc 3 to be connected with the rotating shaft 4 through the coupler 5, before the brake disc 3 is connected with the coupler 5, the force sensor is connected with the coupler 5, and the caliper 6 is used for clamping the force sensor, the force sensor is preset with a plurality of calibration clamping forces, the strain gauge 8 transmits the voltage of the strain conversion circuit under different calibration clamping forces to an upper computer terminal, and finally calculates a relation formula between the clamping force applied to the force sensor (namely the clamping force applied to the brake disc 3) and the voltage of the strain conversion circuit in the strain gauge 8 through data recorded by the upper computer terminal, the force sensor can also be in signal connection with the upper computer terminal, transmits the clamping force data applied to the force sensor and the voltage data of the strain conversion circuit to the upper computer terminal through the force sensor and a voltage detection device in real time, and calculates a relation formula between the clamping force applied to the brake disc 3 and the voltage of the strain conversion circuit in the strain gauge 8, in other schemes, the shape and the connection mode of the force sensor can be changed according to actual needs, for example, the force sensor is detachably connected with the brake disc 3, the brake disc 3 is connected with the rotating shaft 4 through the coupler 5, the force sensor is firstly installed on the outer surface of the brake disc 3 at the part clamped by the clamping pliers 6 when the clamping force applied to the brake disc 3 is tested, and the force sensor is detached from the brake disc 3 after the relation between the clamping force applied to the brake disc 3 and the voltage of the strain conversion circuit is tested and calculated.
Specifically, the MGU rotation speed detection module includes a photoelectric counter 9 fixed on the mounting bracket 2 and aligned to an MGU drive gear of an MGU motor 7 disposed inside the caliper 6, specifically, the MGU motor 7 is a core drive element of an electronic parking brake system, a structure and a working manner of the MGU motor 7 are prior art, and details are not repeated herein, a retraction stroke of a piston 61 in the caliper 6 can be calculated by calculating a rotation tooth number of the MGU drive gear disposed in the MGU motor, the photoelectric counter 9 transmits the rotation tooth number of the MGU drive gear to a terminal of an upper computer in real time and calculates a stroke of the piston 61 in the caliper by a formula, specifically, a relationship between the stroke of the piston 61 and the rotation tooth number of the MGU drive gear is calculated by the following formula:
wherein the actual backspacing stroke of the piston 61 in the caliper 6 is s, the number of the rotation teeth of the MGU driving gear is z, the gear module is m, and the transmission ratio of the MGU is i 1 The screw sleeve transmission ratio is i 2 。
Specifically, the temperature measurement module is including setting up the infrared temperature measuring device in the temperature box, infrared temperature measuring device is infrared temperature measurement sensor, infrared temperature measuring device can set up arbitrary position in the temperature box, for the accuracy of guaranteeing the temperature measurement result, infrared temperature measuring device sets up the position that is close to brake disc 3 in the temperature box is used for real-time supervision the temperature of brake disc 3 to with the temperature variation data real-time transmission of brake disc 3 to host computer terminal.
Specifically, as shown in fig. 1, in the present embodiment, the test bench is used to simulate the real-time braking effect of the EPB system in the static state and in the high-temperature re-clamping state after multiple times of braking, and to input various parameters of the real-time braking effect in each state (such as the clamping force of the caliper 6 in the static state of the brake disc 3, the retraction stroke of the piston 61 in the caliper 6, and the loss value of the clamping force of the caliper 6 in the high-temperature re-clamping state) into the EPB system to form the EPB system matched with the brake to be detected, so in the present embodiment, the caliper 6 (including the MGU motor 7 disposed in the caliper 6) and the brake disc 3 driven by the EPB system are the pieces to be detected, and the rotating shaft 4, the photoelectric counter 9, the force sensor, the infrared temperature measuring device, and the strain gauge 8 (including the voltage detecting device for detecting the strain converting circuit) disposed on the caliper 6 are the detecting device of the test bench, each detection device is in signal connection with the upper computer terminal, starts or stops working according to designation sent by the upper computer terminal, transmits detected corresponding data to the upper computer terminal in real time, and after the upper computer terminal receives the detection data, calculates the detection data to obtain brake data (such as clamping force of a caliper 6, retraction stroke of a piston 61 in the caliper 6 and the like) detected in real time under different states, matches the brake data designated by the original EPB system into the brake data detected in real time under different states, and upgrades the original EPB system into a new EPB system.
As shown in fig. 4, a test method for EPB system verification of a test bench matched with parameters, using a test bench for EPB model verification matched with parameters as described above, includes the following steps:
s1: measuring and calculating the relation between the clamping force and the voltage of the strain conversion circuit;
specifically, the step S1 specifically includes:
s11: fixing the force sensor and the coupler;
specifically, since the force sensor in this embodiment is a disc-shaped force sensor that can replace the brake disc 3 and the coupling 5, before the brake disc 3 is installed, the force sensor needs to be connected to the coupling 5 first, so as to facilitate detection of the clamping force of the caliper 6, in other embodiments, when the force sensor is a force sensor assembly detachably connected to the brake disc 3, the step S11 may be modified as follows: fixing the brake disc 3 and a coupling 5, and fixing a force sensor on the brake disc 3 at a position clamped by the caliper 6;
s12 Upper computer terminal control Caliper continuous clamping force sensor using clamping force of 0KN-30KN at frequency of once every 1KN interval, said force sensor recording every timeThe clamping force sensed by secondary clamping is transmitted to an upper computer terminal, and meanwhile, the voltage of the strain conversion circuit behind the sensor clamped by each caliper is detected in real time by the voltage detection equipment and recorded as U 1 、U 2 、U 3 ……U 30 And transmitting the data to an upper computer terminal;
specifically, since the clamping force of the caliper 6 on the market is generally in the interval of 0KN-30KN, in this scheme, only the data of the clamping force of the caliper 6 in the interval of 0KN-30KN are tested, and for more accurately constructing the relation formula between the clamping force of the caliper 6 and the voltage of the strain conversion circuit in the strain gauge 8, the interval of the clamping force of the caliper 6 at each time can be smaller than 1 KN.
And S13, the upper computer terminal calculates the data relation between the clamping force sensed by the force sensor and the voltage of the corresponding strain conversion circuit and programs the data relation into the EPB system.
Specifically, the step is used for establishing a data relationship between the clamping force sensed by the force sensor and the voltage of the corresponding strain conversion circuit, and since the clamping force sensed by the force sensor is the clamping force sensed by the brake disc 3, the data relationship programmed into the EPB system in the step can be used for calculating the actual clamping force applied to the brake disc 3 by using the voltage of the strain conversion circuit in the subsequent step.
Specifically, after step S1 is completed, the force sensor is detached from the coupling 5 or the brake disc 3, and the brake disc 3 is fixed to the coupling 5.
S2: under the static state of the brake disc, the EPB system is used for controlling the calipers to clamp the brake disc and detecting the actual clamping force borne by the brake disc, and the actual clamping force data is used for replacing the original calibrated clamping force in the EPB system;
specifically, the step S2 specifically includes:
s21: the EPB system is used for controlling the calipers to clamp the brake disc, and the voltage detection equipment detects the voltage of the strain conversion circuit in real time and transmits voltage data to an upper computer terminal;
s22: the upper computer terminal measures the relation between the voltage of the strain conversion circuit and the clamping forceCalculating the actual clamping force F borne by the brake disc Fruit of Chinese wolfberry Will apply the actual clamping force F Fruit of Chinese wolfberry Programming into the EPB system to establish a new nominal clamping force F Sign ；
Specifically, the clamping force required by the calipers 6 and the brake disc 3 of different models is different, so that the parameter of the calibrated clamping force in the EPB system needs to be adjusted according to the models of the calipers 6, and since the relationship between the voltage of the strain conversion circuit and the actual clamping force applied to the brake disc is established through experiments in the step S1, in this step, the actual clamping force applied to the brake disc is converted by using the voltage of the strain conversion circuit, and the actual clamping force F is used Fruit of Chinese wolfberry Replace the original calibrated clamping force F in the EPB system Sign board So that the clamping force F is calibrated instead Sign The subsequent EPB system matches the tested models of the caliper 6 and the brake disc 3, thereby ensuring the accuracy of the control of the EPB system.
S23: updating the calibrated clamping force F by going through step S22 Sign board The subsequent EPB system controls the calipers to clamp the brake disc, and new actual clamping force F is obtained through measurement and calculation Fruit of Chinese wolfberry Determining a new actual clamping force F Fruit of Chinese wolfberry With the calibrated clamping force F in current EPB systems Sign board Whether or not equal to F Fruit of Chinese wolfberry ≠F Sign board When F is reached, steps S21 and S22 are repeated Fruit of Chinese wolfberry = F Sign board At the moment, the actual clamping force F Fruit of Chinese wolfberry Programmed into the EPB system as a final calibrated clamping force F Sign board 。
In the scheme, the clamping force borne by the brake disc is converted through the voltage of the strain conversion circuit, under an ideal state, the clamping force converted through the voltage of the strain conversion circuit is equal to the actual clamping force borne by the brake disc, but in the actual braking process, sudden situations such as sudden change of the voltage value of the strain conversion circuit or detection errors can occur in a single test, so that the clamping force converted through the voltage of the strain conversion circuit and the actual clamping force borne by the brake disc have certain errors, and therefore the updated calibrated clamping force F compiled into the EPB system in the step S22 needs to be verified through repeated tests Sign board Whether the clamping force is equal to the actual clamping force applied to the brake disc or not, thereby further improving the brake disc clamping force programmed into the EPB systemCalibrating clamping force F Sign Ensuring the actual clamping force F to which the brake disc 3 is subjected in the rest condition of the brake disc Fruit of Chinese wolfberry With calibrated clamping force F in EPB systems Sign Are equal.
S3: under the static state of the brake disc, the EPB system is used for controlling the caliper to release, measuring and calculating the actual backspacing stroke of the piston in the caliper, and the original target backspacing stroke in the EPB system is replaced by the actual backspacing stroke data of the piston;
specifically, the step S3 specifically includes:
s31: the EPB system is used for controlling the calipers to be released to a calibration position, and at the moment, the photoelectric counter records the number of rotating teeth of the MGU driving gear and transmits data to the terminal of the upper computer;
specifically, since calipers of different models have different calibration positions in a release state and different retraction strokes in the release process, parameters of a target retraction stroke in the EPB system need to be adjusted according to actual retraction strokes of different models of calipers 6.
Specifically, the photoelectric counter 9 is aligned with an MGU driving gear of an MGU motor 7 arranged inside the caliper 6 and is in signal connection with the upper computer terminal, and when the MGU motor 7 starts to rotate, the photoelectric counter 9 records the number of rotating teeth of the MGU driving gear in real time and transmits data to the upper computer terminal.
S32: calculating the actual backspacing stroke S of the piston according to a relational formula of the backspacing stroke of the piston and the number of the rotating teeth of the MGU driving gear Fruit of Chinese wolfberry Will actually retreat by the stroke S Fruit of Chinese wolfberry Is programmed into an EPB system to replace the original target backspacing stroke S Sign board ；
Specifically, since the piston 61 in the caliper 6 is driven by the MGU motor 7 to perform mechanical movement, the number of rotation teeth of the MGU drive gear provided in the MGU motor 7 is calculated, and the parameter obtained by calculating the actual retraction stroke of the piston 61 using the number of rotation teeth of the MGU drive gear is relatively accurate.
Specifically, the relationship between the stroke of the piston 61 and the number of rotating teeth of the MGU drive gear is calculated by the following equation:
wherein the actual retraction stroke of the piston 61 in the caliper 6 is s, the number of the rotary teeth of the MGU driving gear is z, the gear module is m, and the transmission ratio of the MGU is i 1 The screw sleeve transmission ratio of the screw rod is i 2 。
S33: updating the target retraction stroke S with the elapse of step S32 Sign board The subsequent EPB system controls the calipers to be released to the calibration position, and a new actual backspacing stroke S is obtained through measurement and calculation Fruit of Chinese wolfberry Judging a new actual backspacing stroke S Fruit of Chinese wolfberry With the target backspacing stroke S in the current EPB system Sign Whether or not to be equal when S Fruit of Chinese wolfberry ≠S Sign board When so, repeating steps S31 and S32, when S Fruit of Chinese wolfberry = S Sign board At the moment, the actual backspacing stroke S at the moment Fruit of Chinese wolfberry Programmed into the EPB system as a final target retraction stroke S Sign board 。
Specifically, because the retraction stroke of the calipers is converted by the number of the rotating teeth of the MGU driving gear, in an ideal state, the retraction stroke, in which the number of rotating teeth of the MGU drive gear is converted according to the formula, is equal to the actual retraction stroke of the piston 61 in the caliper 6, but during the actual release, there may be some error, however, during the release, if the position of the piston 61 after the retraction does not reach the calibration position, the abrasion of the friction material in the caliper 6 is easily accelerated to cause eccentric abrasion and even locking, the service life of the caliper 6 is shortened, meanwhile, if the position of the piston 61 after the retraction exceeds the calibration position, since the clamping force of the caliper 6 is already determined, in the subsequent braking process, the problem that the piston 61 is too far back to push the friction material to clamp the brake disc 3 or reduce the clamping force easily occurs, and the braking effect is influenced; when the actual retraction stroke S of the piston 61 Fruit of Chinese wolfberry = target retraction stroke S Sign board In the process, the piston 61 can be ensured to retreat to the calibration position, and the friction plate of the caliper 6 can not contact with the brake disc 3, so that a final target retreat stroke equal to the actual retreat stroke of the piston needs to be obtained through multiple tests, and the finally determined target retreat stroke is ensuredRun length S Sign board The actual retraction stroke S of the piston 61 when the EPB system controls the release of the caliper 6 is programmed into the existing EPB system Fruit of Chinese wolfberry = target retraction stroke S Sign And after the calipers are released, the piston just reaches the calibration position.
Specifically, the steps S2 to S3 simulate the clamping and releasing actions of the caliper 6 when the brake disc 3 is in a static state, and program the clamping force of the caliper 6 and the parameters related to the retraction stroke of the piston 61 in the EPB system during the test process to match the parameters in the EPB system with the used caliper, but in the actual braking process, the brake disc 3 continuously rotates before the caliper 6 clamps the brake disc, and there may be a case of clamping the caliper 6 for multiple times, after the caliper 6 is clamped for multiple times under the condition that the brake disc 3 rotates, the temperature of the brake disc 3 rises to 400 ℃ to 500 ℃, and as the temperature of the brake disc 3 rises, the brake disc 3 is affected by the principle of thermal expansion and cold contraction, the volume of thermal expansion increases, and the clamping force required by the brake disc is smaller, so that the actual clamping force change of the brake disc 3 in a high temperature state needs to be simulated, and the related parameters are programmed in the EPB system, perfects the function and adaptability to environment of the EPB system, and therefore, according to the above requirements, step S4 is added: and detecting the change of the clamping force of the caliper 6 in a high-temperature re-clamping state, and programming the change into an EPB system.
Specifically, the step S4 specifically includes:
s41: the driving motor drives the rotating shaft to rotate and drives the coupler and the brake disc to rotate, and the calipers are controlled to clamp and release repeatedly until the temperature in the temperature box reaches 400-500 ℃ and then stop rotating;
s42: after the brake disc stops rotating, the EPB system controls the calipers to use the calibrated clamping force F Sign board Clamping the heated brake disc, and then detecting the voltage of the strain conversion circuit in real time by using voltage detection equipment and transmitting voltage data to an upper computer terminal;
s43: and the upper computer terminal calculates and calculates the clamping force of the brake disc in the high-temperature state according to the relation between the voltage of the strain conversion circuit and the clamping force, and records the clamping force of the brake disc in the high-temperature state into the EPB system.
Further, as the brake disc is stationary, the brake disc gradually cools and contracts, the volume of the brake disc 3 is reduced, and under the condition that the same clamping force is applied to the brake disc, the lower the temperature of the brake disc is, the smaller the clamping force is, so that the clamping force loss is generated in the process of the temperature reduction of the brake disc, in order to accurately calculate the difference of the clamping forces applied to the brake disc at different temperatures, and thereby determine the change of the loss value of the clamping force, the step S4 further includes the following steps:
s44: monitoring the temperature change of the brake disc in a high-temperature gradual cooling state by using an infrared temperature measuring device, continuously clamping the brake disc by using calipers in the temperature cooling process, measuring and calculating the clamping force borne by the brake disc during each clamping according to the relation between the voltage of the strain conversion circuit and the clamping force, and transmitting data to an upper computer terminal;
s45: and obtaining a change relation curve between the temperature and the clamping force borne by the brake disc according to the data of the clamping force borne by the brake disc at different temperatures recorded in the upper computer terminal, and compiling the relation curve into the EPB system.
Specifically, according to the relation curve obtained in the above step, in the actual braking process, the EPB system can calculate the loss value of the clamping force applied to the brake disc according to the temperature of the brake disc 3 detected in real time, and meanwhile, the temperature of the brake disc 3 detected in real time is substituted into the change relation curve between the temperature and the clamping force applied to the brake disc, so that the clamping force required at the temperature can be obtained, and at the moment, the EPB system can control the caliper to apply the clamping force required at the current temperature to the brake disc, so that the clamping force loss is prevented.
Specifically, the step S4 further includes the following steps:
s46: repeating the steps S44 and S45 at different initial temperatures to obtain the relationship curve between the temperature and the clamping force of the caliper at different initial temperatures, and comparing the relationship curve with the relationship curve in the step S45.
Specifically, in order to further determine the accuracy of the curve of the variation relationship between the temperature obtained in the above steps S44 and S45 and the clamping force applied to the brake disc, several different initial temperatures are selected within the temperature range of 400 ℃ to 500 ℃, and the steps S44 and S45 are repeated, so that the relationship between the temperature and the clamping force applied to the brake disc is obtained when the initial temperatures of the brake disc are different under the premise that the caliper applies the same calibrated clamping force to the brake disc, as shown in fig. 3, three initial temperatures are set in the scheme, which are T1, T2 and T3, wherein T1 is greater than T2 and less than T3, in order to more intuitively represent the variation of the clamping force during the cooling process of the brake disc at different initial temperatures, the abscissa in fig. 3 is the stopping time (increasing with the stopping time and decreasing the temperature) of the brake disc, and the ordinate is the clamping force applied to the brake disc, in the simulation process, when the initial temperatures of the brake disc 3 are T1, T2 and T3 respectively, the caliper 6 continuously clamps the brake disc 3 with the calibrated clamping force, the strain gauge 8 transmits the voltage data of the strain conversion circuit during each clamping to the terminal of the upper computer through the voltage detection device, and the upper computer terminal is utilized to calculate the variation relation curve between the temperature and the clamping force of the brake disc 3 when the initial temperature of the brake disc 3 is T1, T2 and T3 respectively, as shown in fig. 3, it can be obviously seen that the larger the initial temperature of the brake disc 3 during clamping by the caliper 6 is, the larger the actual loss value of the clamping force applied to the brake disc 3 in the time interval is, further, the variation relation curves between the temperatures obtained at the three initial temperatures of T1, T2 and T3 and the clamping force applied to the brake disc are put into corresponding positions in the variation relation curve obtained in the step S45 for comparison, when the variation relationship curves between the temperatures obtained at the three initial temperatures of T1, T2 and T3 and the clamping force applied to the brake disc coincide with the variation relationship curve obtained in step S45, it is proved that the variation relationship curve obtained in step S45 is more accurate.
An EPB system is verified and adjusted according to the test method of the test bench for verifying the EPB model and matching the parameters.
The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.
Claims (7)
1. A test method of a test bench for EPB model verification and parameter matching is characterized in that: a test rig for validating a match to a parameter using an EPB model, comprising:
the rack is arranged in the temperature box and at least comprises a base and a mounting bracket vertically arranged on the base;
the brake simulation module comprises a rotating shaft which is rotatably arranged on the mounting bracket, a coupler is coaxially arranged at one end of the rotating shaft, which is far away from the mounting bracket, the rotating shaft is driven by a driving motor and drives the coupler to rotate in the same direction, a brake disc is detachably arranged on the coupler, and a caliper for clamping the brake disc is also arranged on the rack;
the clamping force testing module comprises a strain gauge, a force sensor and a control module, wherein the strain gauge is arranged outside the caliper, a strain conversion circuit is arranged in the strain gauge, the voltage of the strain conversion circuit is detected through voltage detection equipment, and the voltage data of the strain conversion circuit is transmitted to a terminal of an upper computer;
the MGU rotating speed detection module comprises a photoelectric counter which is fixed on the mounting bracket and is aligned to an MGU driving gear of an MGU motor arranged in the calipers, the photoelectric counter transmits the number of rotating teeth of the MGU driving gear to the terminal of an upper computer in real time and measures and calculates the backspacing stroke of a piston in the calipers through a formula;
the temperature measuring module comprises an infrared temperature measuring device arranged in a temperature box;
the method comprises the following steps:
s1: measuring and calculating the relation between the clamping force and the voltage of the strain conversion circuit;
after step S1 is completed, detaching the force sensor from the coupling, and fixing the brake disc with the coupling;
s2: under the static state of the brake disc, the EPB system is used for controlling the calipers to clamp the brake disc and detecting the actual clamping force borne by the brake disc, and the actual clamping force data is used for replacing the original calibrated clamping force in the EPB system;
the step S2 specifically includes:
s21: the EPB system is used for controlling the calipers to clamp the brake disc, and the voltage detection equipment detects the voltage of the strain conversion circuit in real time and transmits voltage data to an upper computer terminal;
s22: the upper computer terminal measures and calculates the actual clamping force F borne by the brake disc according to the relation between the voltage of the strain conversion circuit and the clamping force Fruit of Chinese wolfberry Will apply the actual clamping force F Fruit of Chinese wolfberry Programming into EPB system to form new calibrated clamping force F Sign board ；
S23: updating the calibrated clamping force F by going through step S22 Sign board The subsequent EPB system controls the calipers to clamp the brake disc, and new actual clamping force F is obtained through measurement and calculation Fruit of Chinese wolfberry Determining a new actual clamping force F Fruit of Chinese wolfberry With the calibrated clamping force F in current EPB systems Sign board Whether or not equal to F Fruit of Chinese wolfberry ≠F Sign board When F is reached, steps S21 and S22 are repeated Fruit of Chinese wolfberry = F Sign board At the moment, the actual clamping force F Fruit of Chinese wolfberry Programmed into the EPB system as a final calibrated clamping force F Sign board ；
S3: in a static state of the brake disc, the EPB system is used for controlling the calipers to be released to a calibration position, the actual backspacing stroke of a piston in the calipers is measured and calculated, and the original target backspacing stroke in the EPB system is replaced by the actual backspacing stroke data of the piston;
s4: detecting the change of clamping force and temperature change of the brake disc under the high-temperature re-clamping state, measuring and calculating the relation between the actual clamping force and temperature change of the brake disc, and programming the relation into an EPB system;
the step S4 specifically includes:
s41: the driving motor drives the rotating shaft to rotate and drives the coupler and the brake disc to rotate, and the calipers are controlled to clamp and release repeatedly until the temperature in the temperature box reaches 400-500 ℃ and then stop rotating;
s42: after the brake disc stops rotating, the EPB system controls the calipers to use the calibrated clamping force F Sign board Clamping the heated brake disc, and then detecting the voltage of the strain conversion circuit in real time by using voltage detection equipment and transmitting voltage data to an upper computer terminal;
s43: and the upper computer terminal calculates the clamping force applied to the brake disc in the high-temperature state according to the relation between the voltage of the strain conversion circuit and the clamping force, and inputs the clamping force applied to the brake disc in the high-temperature state into the EPB system.
2. The test method for the EPB model validation of parameter matching test bench of claim 1, wherein: the step S1 specifically includes:
s11: fixing the force sensor and the coupler;
s12, the upper computer terminal controls the calipers to use a clamping force of 0-30 KN to continuously clamp the force sensor at a frequency of 1KN at intervals, the force sensor records the clamping force sensed by each clamping and transmits data to the upper computer terminal, and meanwhile, the voltage detection equipment detects the voltage of the strain conversion circuit behind the sensor clamped by each calipers in real time and records the voltage as U 1 、U 2 、U 3 ……U 30 And transmitting the data to an upper computer terminal;
and S13, the upper computer terminal calculates the data relation between the clamping force sensed by the force sensor and the voltage of the corresponding strain conversion circuit and programs the data relation into the EPB system.
3. The test method for the EPB model validation of parameter matching test bench of claim 1, wherein: the step S3 specifically includes:
s31: the EPB system is used for controlling the calipers to be released to a calibration position, and at the moment, the photoelectric counter records the number of rotating teeth of the MGU driving gear and transmits data to the terminal of the upper computer;
s32: and calculating the actual retraction stroke S of the piston according to a relational formula of the retraction stroke of the piston and the number of the rotating teeth of the MGU driving gear Fruit of Chinese wolfberry Will actually retreat by the stroke S Fruit of Chinese wolfberry Is programmed into an EPB system to replace the original target backspacing stroke S Sign board ；
S33: updating the target retraction stroke S with the elapse of step S32 Sign board The subsequent EPB system controls the calipers to be released to the calibration position, and a new actual backspacing stroke S is obtained through measurement and calculation Fruit of Chinese wolfberry Judging a new actual rollbackRun length S Fruit of Chinese wolfberry With the target backspacing stroke S in the current EPB system Sign board Whether or not to be equal when S Fruit of Chinese wolfberry ≠S Sign board When so, repeating steps S31 and S32, when S Fruit of Chinese wolfberry = S Sign board At the moment, the actual backspacing stroke S Fruit of Chinese wolfberry Programmed into the EPB system as a final target backspacing stroke S Sign board 。
4. The test method for an EPB model validation of a test bench matched to parameters according to claim 1, wherein: the relationship between the retraction stroke of the piston and the number of rotating teeth of the MGU drive gear is calculated by the following formula:
wherein the actual retraction stroke of the piston in the caliper is s, the number of the rotating teeth of the MGU driving gear is z, the gear module is m, and the transmission ratio of the MGU is i 1 The screw sleeve transmission ratio is i 2 。
5. The test method for the EPB model validation of parameter matching test bench of claim 1, wherein: the step S4 further includes:
s44: monitoring the temperature change of the brake disc in a high-temperature gradual cooling state by using an infrared temperature measuring device, continuously clamping the brake disc by using calipers in the temperature cooling process, measuring and calculating the clamping force borne by the brake disc during each clamping according to the relation between the voltage of the strain conversion circuit and the clamping force, and transmitting data to an upper computer terminal;
s45: and obtaining a change relation curve between the temperature and the clamping force borne by the brake disc according to the data of the clamping force borne by the brake disc at different temperatures recorded in the upper computer terminal, and compiling the relation curve into the EPB system.
6. The test method for the EPB model validation of parameter matching test bench of claim 5, wherein: the step S4 further includes:
s46: and repeating the steps S44 and S45 at different initial temperatures to obtain the relationship curve between the temperature and the clamping force of the caliper at different initial temperatures, and comparing the relationship curve with the relationship curve in the step S45.
7. An EPB system, characterized by: verified and adapted according to the testing method of the test bench for verification of EPB models matching parameters according to any of claims 1-6.
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